CPC Definition - Subclass H01F

Last Updated Version: 2020.01
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites C04B 35/26; alloys C22C; {construction of loading coils H01B} ; thermomagnetic devices H01L 37/00; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R)
Definition statement

This place covers:

Magnets or magnetic bodies characterised by the magnetic materials therefor. Selection of materials for their magnetic properties (H01F 1/00).

Thin magnetic films (H01F 10/00).

Permanent magnets (H01F 7/00).

Electromagnets (H01F 7/00) including, for example, superconductive magnets (H01F 6/00); details thereof such as coils (H01F 5/00), cores, yokes, and armatures (H01F 3/00).

Fixed and variable transformers including, for example, superconductive or cryogenic transformers; adaptations thereof for specific applications or functions; details thereof (H01F 19/00, H01F 21/00, H01F 27/00, H01F 29/00, H01F 30/00, H01F 36/00, H01F 38/00).

Fixed and variable inductances; adaptations thereof for specific applications or functions; details thereof (H01F 17/00, H01F 21/00, H01F 27/00, H01F 29/00, H01F 37/00, H01F 38/00).

Apparatus or processes for magnetizing or demagnetizing (H01F 13/00).

Apparatus or processes specially adapted for manufacturing or assembling devices covered by this subclass (H01F 41/00).

Further information:

Groups H01F 17/00-H01F 38/00 (with the exception of groups H01F 27/42 and H01F 38/32) cover only structural or constructional aspects of transformers, inductive reactors, chokes or the like.These groups do not cover circuit arrangement of such devices, which are covered by the appropriate functional places.

References
Limiting references

This place does not cover:

Magnets used to separate solid materials from other solid materials or fluids

B03C 1/00

Magnetic work holders

B23Q 3/00, B25B 11/00

Apparatus or processes for degaussing ships

B63G 9/06

Lifting magnets

B66C 1/00

Magnets or electromagnets in electric meters

G01R

Devices for demagnetizing parts of clocks and watches

G04D 9/00

Magnetic record carriers

G11B 5/00

Apparatus or processes specially adapted for manufacturing magnetic record carriers

G11B 5/84

Thin-film magnetic stores

G11C

Apparatus or processes for threading magnetic cores in digital storage elements

G11C 5/12

Magnets or electromagnets in relays

H01H

Magnets or electromagnets in dynamo-electric machines

H02K

Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing dynamo-electric machines, e.g. forming windings prior to mounting into the machine

H02K 15/00

Arrangements for controlling transformers, reactors or choke coils for the purpose of obtaining a desired output

H02P 13/00

Magnetic amplifiers

H03F

Impedance networks

H03H

Demagnetizing arrangements for color television

H04N 9/29

Acoustic electromechanical transducers having coils or permanent magnets

H04R

Informative references

Attention is drawn to the following places, which may be of interest for search:

Powder metallurgy

B22F

Iron oxides (not sintered)

C01G 49/02

Ferrite based ceramics

C04B 35/26

Ferrous alloys

C22C

Coating by evaporation or sputtering

C23C 14/00

Refrigeration machines using magnetic effects

F25B 21/00

Magneto-optical devices

G02F 1/09

Sensing record carriers using inductive or magnetic sensors

G06K 7/08

Semiconductor devices with potential-jump barrier or surface barrier controllable by variation of the magnetic field applied to the devices

H01L 29/82

Thermomagnetic devices

H01L 37/00

Magnetostrictive devices

H01L 41/12

Devices using galvano-magnetic or similar magnetic effects

H01L 43/00

Screening of electric apparatus against magnetic fields

H05K 9/00

Special rules of classification
  • Documents are classified with a CPC symbol according to the invention information mainly found in the claims with due regard given to the description and the figures. Additional information found in the claims and in the description and figures, which might be relevant for future searches is given an Indexing Code symbol.
  • Main groups H01F 1/00, H01F 10/00 and subgroups H01F 41/14-H01F 41/34:

Classification proceeds by assigning the most restricted possible CPC symbol to the document, followed by additional knowledge tagging using Indexing Code symbols. This implies that CPC head subgroups (corresponding to IPC subgroups) should only be used if no other possibility could be found for classifying the document in a more restricted subgroup.

If the set of claims comprises product or article and method claims an CPC symbol should be assigned to each of these categories. However if the most suitable subgroup for a claim of a given category, e.g. product, does not exist in the main group of the same category, e.g. product group, and can only be found in groups of another corresponding category, e.g. a group for a method to manufacture the product, this latter subgroup should be assigned to the claim e.g. method subgroup assigned to a product claim. For example a document with no method claims dealing with a magnetic tunnel junction in which the spacer has been processed in such a way that its material structure becomes inventive, would still be given the method CPC symbol H01F 41/307 as product CPC symbol H01F 10/3254 is silent over any material inventive features.

Another use of Indexing Codes can be made for particular cases where the invention is a specific property of a given type of material or article and this property is classified only in subgroups of another specific material type. In this case the corresponding CPC symbol cannot be given. Consequently the Indexing Code should be given together with an CPC symbol corresponding to the material described in the document. For example: a sintered nanocomposite exchange spring magnet of SmCo/Fe cannot be given H01F 1/0579 as CPC symbol since the latter symbol belongs to NdFeB magnets classification subtree. Therefore the combination H01F 1/0557 and H01F 1/0579 should be used.

  • Remaining main groups of H01F:

Multi-aspect classification is used. This means that several subgroups are assigned to a document if several relevant features are present. It is, for example, not mandatory to use the next general subgroup H01F 27/28 for transformer windings if printed winding (H01F 27/2804) and wire winding (H01F 27/2823) are combined in one transformer. Instead, subgroups H01F 27/2804 and H01F 27/2823 are both assigned to the respective document.

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Compound

homogenous substance comprising at least two elements, having a non-metallic character and a specific (fixed) composition ratio, including also intermetallic compounds.

Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
Definition statement

This place covers:

Bulk magnetic materials: antiferromagnetic, diamagnetic, paramagnetic, hard and soft ferromagnetic materials.

0D, 1D and 2D magnetic (nano)structures.

Materials cover metallic materials, compounds (i.e. mainly non-metallic materials) or organic materials. Selected types of magnetic materials are highlighted within specific subgroups.

H01F 1/00 is mainly concerned with bulk materials except for some specific subgroups.

H01F 1/0009 covers antiferromagnetic bulk material.

H01F 1/0018 covers diamagnetic or paramagnetic bulk material.

H01F 1/0027 covers thick magnetic films formed with methods classified under H01F 41/16.

References
Limiting references

This place does not cover:

Methods to manufacture magnetic hard or soft articles out of said materials

H01F 41/00- H01F 41/0293

Informative references

Attention is drawn to the following places, which may be of interest for search:

Working metallic powder; manufacturing powder (related to H01F 1/0045; H01F 1/06; H01F 1/20- H01F 1/28)

B22F 1/00, B22F 1/02, B22F 9/00

Iron oxides carriers (related to H01F 1/342, H01F 1/36)

C01G 49/02

Making alloys by powder metallurgy (related to H01F 1/0045; H01F 1/06; H01F 1/20- H01F 1/28; H01F 1/14766; H01F 1/14708)

C22C 1/04

Non-ferrous alloys containing 5-50% by weight of oxides, carbides, borides, nitrides, silicides etc. (related to H01F 1/09, H01F 1/33, H01F 1/14708, H01F 1/14766)

C22C 32/00

Making ferrous alloys (related to H01F 1/14708, H01F 1/14766)

C22C 33/00

Cast iron alloys (related to H01F 1/14708, H01F 1/14766)

C22C 37/00

Ferrous alloys (related to H01F 1/14708, H01F 1/14766)

C22C 38/00

Amorphous alloys and related processes (related to H01F 1/153)

C22C 45/00

Single crystal growth, unidirectional solidification (related to H01F 1/0072)

C30B

Electromagnetic interference suppressing, shielding (related to H01F 1/26, H01F 1/28)

H05K 9/0073

Special rules of classification

Treatment of the materials, e.g. compacting, sintering, bonding are also classified into this group.

{Thick magnetic films (forming thick magnetic films H01F 41/16)}
Definition statement

This place covers:

Thick magnetic films characterized by being manufactured with methods associated under H01F 41/16. This subgroup encompasses single layers and multiple layers of thick films. This subgroup primarily includes soft magnetic thick films but also includes hard magnetic thick films meeting the above requirements.

Thick magnetic films can be distinguished from thin magnetic films by assessing their respective manufacturing methods:

Thick magnetic films are typically obtained from magnetic particles and bonding agent, according to manufacturing methods of groups H01F 41/16 thereby forming a composite film.

Thin magnetic films are typically obtained by deposition or plating of magnetic material, according to manufacturing methods of groups H01F 41/18-H01F 41/34.

References
Limiting references

This place does not cover:

Forming thick magnetic films

H01F 41/16

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Magnetic record carriers

G11B 5/70

Special rules of classification

Hard magnetic thick films applied in magnetic record carriers are classified under G11B 5/70.

Hard magnetic thick films forming permanent magnets are classified according to the composition of the magnetic particles; i.e. under H01F 1/047 and its subgroups, primarily under H01F 1/0533, H01F 1/0558 or H01F 1/0578. When the composition of the magnetic particles is nominal, i.e. not a restriction, classification will usually fall under H01F 1/08 and its subgroups, i.e. H01F 1/083.

{showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity, (H01F 1/153, H01F 1/42 and H01F 10/00 take precedence; magnetoresistive sensors G01D 5/16, G01R 33/06; magnetoresistive recording G11B 5/39; magnetic-field-controlled resistors H01L 43/08)}
Definition statement

This place covers:

These subgroups cover:

0D, 1D and 2D magnetic (nano)structures wherein the size and carriers confinement alters the magnetic properties. Embedded magnetic nanostructures.

References
Limiting references

This place does not cover:

Hard magnetic particles

H01F 1/06- H01F 1/09 and H01F 1/11- H01F 1/117

Nanosized particles used in magnetic cores, electromagnetic noise suppressing sheets

H01F 1/20- H01F 1/33 and H01F 1/36- H01F 1/38

Magnetorheological fluids

H01F 1/44- H01F 1/447

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Nuclear magnetic resonance imaging: preparations for testing in vivo including magnetic particles

A61K 49/06

Magnetic separation process including magnetic particles

B03C 1/01

Special rules of classification

1. Nanoparticles used in bioscreening (diagnostic, separation) are classified in these subgroups irrelevant of their composition and size effect.

2. If a strong effect of the size of the nanoparticles belonging to the groups cited in the above table is shown on the magnetic properties, then it is also classified in H01F 1/0036-H01F 1/0063

of inorganic materials (H01F 1/44 takes precedence)
Definition statement

This place covers:

Magnetocaloric materials. Subdivided in metallic or compounds materials.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cryogenic machines using magnetic effects based on a magnetocaloric material

F25B 21/00

characterised by their coercivity {(H01F 1/40 takes precedence)}
Definition statement

This place covers:

Materials with specific coercivity; Laves phases or magnetic shape memory materials. Mainly those latter examples are classified in these subgroups.

of hard-magnetic materials
Definition statement

This place covers:

Hard magnetic metals or alloys characterised by composition, by shape and by the process or treatments to obtain articles including these materials.

Subgroup H01F 1/0579 is concerned with nanocomposite exchange spring magnets.

H01F 1/057 covers so-called R-T-B magnets (Nd2Fe14B phase).

H01F 1/059 covers magnets with a Sm2Fe17N2 phase.

References
Limiting references

This place does not cover:

Permanent magnets with emphasis on the structure or use rather than the material

H01F 7/02

Method claims directed at manufacturing or treating magnets

H01F 41/0253- H01F 41/0293

Actuators, dynamo-electric rotating machines, motors (related to H01F 1/053- H01F 1/059)

H02K 1/00

Special rules of classification

Magnets obtained from the corresponding materials are classified in the same subgroups according to method criteria (process or treatments undergone by the material forming the magnet) on which part of the classification refinement is based.

in the form of particles, e.g. powder (H01F 1/047 takes precedence {; record carriers G11B 5/70605})
Definition statement

This place covers:

Hard magnetic metallic particles characterised by shape and by treatments to obtain articles including these materials.

The subgroups are generally concerned with particles used in magnetic recording or under subgroup H01F 1/08 metallic particles for permanent magnets when composition is not specifically mentioned in the claims.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Magnetic record carriers

G11B 5/00

Magnetic record carriers (metal or alloy material, related to H01F 1/06+)

G11B 5/70605

Magnetic record carriers (non-metallic material, related to H01F 1/11)

G11B 5/70626

Apparatus or processes specially adapted for manufacturing magnetic record carriers

G11B 5/84

mixtures of metallic and non-metallic particles; metallic particles having oxide skin
Definition statement

This place covers:

Hard magnetic non-metallic particles characterised by shape and by treatments to obtain articles including these materials.

H01F 1/09 can cover hard metallic particles covered with an oxide layer

Special rules of classification

For rare earth containing particles covered with an oxide layer, subgroups H01F 1/0552 and H01F 1/0572 would take precedence except if the oxide layer is the core of the invention.

non-metallic substances, e.g. ferrites {, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure}
Definition statement

This place covers:

Hard non-metallic magnets such as Ba-ferrite type of magnets

of soft-magnetic materials
Definition statement

This place covers:

Soft magnetic metals or alloys characterised by composition, by shape and treatments to obtain articles including these materials.

Special rules of classification

Fe-Ni and Fe-Si alloys and their shape are classified in the subgroups H01F 1/14708-H01F 1/14791.

Other compositions than Fe-Ni, Fe-Si must be classified according to a shape criterion: subgroups H01F 1/16 and onwards for sheets, H01F 1/20 and onwards for particles and H01F 1/143 for wires or for no specific shape given: subgroup H01F 1/147. If no specific shape or composition criterion is given, the H01F 1/14 symbol should be given.

Amorphous metallic alloys, e.g. glassy metals {(making ferrous amorphous alloys C22C 33/003)}
Definition statement

This place covers:

Soft magnetic amorphous metals, also including nanocrystallites, characterised by composition and by methods to obtain articles including these materials.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Security coding

G07D 7/00

Alarms using amorphous ferromagnetic tags

G08B 13/2408

Special rules of classification

The method section of these subgroups has to be used in combination with the method subgroups H01F 41/0206-H01F 41/0246.

in the form of sheets (H01F 1/147 takes precedence)
Definition statement

This place covers:

Soft magnetic sheet of metals or alloys.

H01F 1/18 covers insulated sheets

in the form of particles, e.g. powder (H01F 1/147 takes precedence)
Definition statement

This place covers:

Soft magnetic particles of metals or alloys characterised by shape and by treatments or methods to obtain articles including these materials.

H01F 1/20 covers particles

H01F 1/22 covers compacted particles.

H01F 1/24 covers insulated compacted particles.

H01F 1/26 covers compacted particles wherein insulator are organic macromolecules.

Subgroup H01F 1/28 concerns non compacted bodies.

Special rules of classification

Soft magnetic particles compacted in a bonded body (magnetic core or noise suppressing sheet) are classified in H01F 1/26 in combination with H01F 41/0246 for magnetic cores only.

mixtures of metallic and non-metallic particles; metallic particles having oxide skin
Definition statement

This place covers:

Soft metallic particles covered with an oxide layer.

non-metallic substances, e.g. ferrites
Definition statement

This place covers:

Soft non-metallic materials characterised by composition, by shape and treatments to obtain articles including these materials.

H01F 1/34 covers bulk non metallic material such as ferrite.

H01F 1/36 covers non-metallic particles.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Ferrite based ceramics described only by chemical composition

C04B 35/26

Special rules of classification

Subgroup H01F 1/24 would take precedence in the case of oxide insulated particles being part of a compacted body.

of magnetic semiconductor materials, e.g. CdCr2S4 (devices using galvano-magnetic or similar effects H01L 43/00)
Definition statement

This place covers:

Magnetic semiconductors and half-metals (Heusler).

Special rules of classification

Perovskites (H01F 1/407) and half-metals (H01F 1/408) are classified under the arborescence of magnetic semiconductors even if they might not be necessarily a semiconducting material.

of organic or organo-metallic materials {, e.g. graphene} (H01F 1/44 takes precedence)
Definition statement

This place covers:

Organic or organo-metallic materials.

of magnetic liquids, e.g. ferrofluids (particles in a bonding agent H01F 1/28, H01F 1/36, {H01F 1/37})
Definition statement

This place covers:

Magnetic and magnetorheologic fluids.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Nuclear magnetic resonance imaging: preparations for testing in vivo including magnetic particles

A61K 49/06

Magnetorheological fluid dampers including a ferrofluid

F16F 9/535

Cores, Yokes, or armatures (magnetic materials H01F 1/00; permanent magnets H01F 7/02)
Definition statement

This place covers:

Cores, yokes and armatures which are single parts or arrangements of several parts of ferromagnetic material used to guide magnetic flux.

Further information:

  • Cores, yokes and armatures are covered by H01F 3/00 if:- no specific application is mentioned,- a special application is mentioned for which no specific subgroup exists elsewhere,- they comprise specific features for which no subgroups exist in the specific subgroup for the application (e.g. transformer cores which are normally classified in H01F 27/24 have to be classified in H01F 3/10 if they are made from a combination of materials and in H01F 3/14 if they comprise air gaps).
  • H01F 3/02 and H01F 3/04:A core made from a stack of strips is covered by H01F 3/02 although this subgroup refers to sheets.The subgroup H01F 3/04 for strips and ribbons predominantly covers cores which are fabricated by winding the strips on a mandrel.
References
Limiting references

This place does not cover:

Magnetic materials per se

H01F 1/00

Permanent magnets

H01F 7/02

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Magnet cores of signal inductances

H01F 17/04

Details of magnet cores of transformers or inductances in general

H01F 27/24

Magnetic shunt path in the case of transformers/inductances ( related to H01F 3/12)

H01F 27/38

Apparatus or processes for manufacturing magnet cores

H01F 41/0206

Magnetic cores for electric motors/generators

H02K 1/00

Coils (superconducting coils H01F 6/06; fixed inductances of the signal type H01F 17/00)
Definition statement

This place covers:

Printed coils.

Wound electric conductors.

Further information:

  • Coils are covered by H01F 5/00, if:- no specific application is mentioned,- a special application is mentioned for which no specific subgroups exist elsewhere,- they comprise specific features for which no subgroups exist in the specific subgroup for the application (e.g. a bobbin for an electromagnet is classified in H01F 5/02 although electromagnets are normally classified in H01F 7/06).
  • H01F 5/04:This subgroup predominantly refers to terminals attached to bobbins.Bobbins characterised by details for attaching terminals are classified here and not in the subgroup H01F 5/02 for bobbins.
References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Superconducting coils

H01F 6/06

Printed coils for signal inductances

H01F 17/0006

Coils for transformers/inductances

H01F 27/28

Printed coils for transformers/inductances

H01F 27/2804

Bobbins for transformers/inductances (related to H01F 5/02)

H01F 27/325

Bobbins in relation with apparatus or processes for manufacturing coils (related to H01F 5/02)

H01F 41/098

Loop aerials (antennae)

H01Q 7/00

Coils for electric motors/generators

H02K 3/00

Coil arrangements for induction heating

H05B 6/36

Informative references

Attention is drawn to the following places, which may be of interest for search:

Apparatus or processes for manufacturing coils

H01F 41/04

Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "former" and "bobbin, spool, (coil/winding) support, (coil/winding) body, tube, sleeve"
  • "coil" and "winding, solenoid"
Superconducting magnets; Superconducting coils {(magnetic resonance assemblies using superconducting coil systems G01R 33/3815)}
Definition statement

This place covers:

Superconducting magnets and coils and accessories necessary to operate them.

Further information:

  • Superconducting magnets can be superconducting bulk pieces cooled below the critical temperature in a magnetic field or superconducting coils. For use as magnets, the coils are often shorted ("persistent mode" or "persistent current mode").
  • Constructive details of inductive superconducting current limiters are covered by H01F 6/00.
References
Limiting references

This place does not cover:

Superconductive cables

H01B 12/00

Devices using superconductivity in general

H01L 39/00

Resistive superconducting current limiters (related to H01F 6/00)

H01L 39/16

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Superconducting transformers

H01F 36/00

Superconducting coils used in magnetic separation of materials (related to H01F 6/06)

B03C 1/0337, B03C 1/0355

Magnet systems for NMR using superconducting coils (related to H01F 6/06)

G01R 33/3815

Informative references

Attention is drawn to the following places, which may be of interest for search:

Apparatus or processes for manufacturing superconductive coils

H01F 41/048

Emergency protective circuits for limiting excessive current using superconducting elements (related to H01F 6/00)

H02H 9/023

Magnets (superconducting magnets H01F 6/00; for separation of solid materials or fluids B03C 1/00; for bench or like work-holders B23B 31/28, B23Q 3/00; work-holding devices B25B 11/00; lifting magnets B66C 1/00; {operating or controlling locks using permanent magnets E05B 47/0038; devices for holding a wing, e.g. door or window, by magnetic or electromagnetic attraction E05C 19/16; relieving load or bearings using magnetic means F16C 39/06} ; for electric meters G01R; for relays H01H; {for electric discharge tubes H01J, e.g. H01J 3/24, H01J 23/10, H01J 29/68} ; for dynamo-electric machines H02K)
Definition statement

This place covers:

Magnets in general.

Further information:

  • The two principal subgroups are H01F 7/02 for permanent magnets and H01F 7/06 for electromagnets.
  • Electromagnets comprising permanent magnets in any part of the magnetic circuit are covered as follows:- by H01F 7/1615 or H01F 7/1646 if they comprise a rectilinearly movable armature,- by H01F 7/122 if the armature is not or not only rectilinearly movable,- by H01F 7/20 if they do not comprise a movable armature.
References
Limiting references

This place does not cover:

Superconducting magnets

H01F 6/00

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

H01F 7/00 in general:

Magnets or electromagnets for electric meters

G01R

Magnets or electromagnets for relays

H01H

Magnets or electromagnets for dynamo-electric machines

H02K

Permanent magnets (H01F 7/02):

Magnets for fastening garments

A41F 1/002

Magnetic fasteners for bags

A45C 13/1069

Magnets used to separate solid materials from other solid materials or fluids

B03C 1/00

Chucks using magnetic means

B23B 31/28

Devices for holding work using magnetic or electric force acting directly on the work

B23Q 3/15

Magnetic work holders

B25B 11/002

Screwdrivers using magnetic means

B25B 23/12

Griping heads with magnetic holding means

B25J 15/0608

Load-engaging elements for cranes attached by magnetic means

B66C 1/04

Treatment of water by magnetic fields using permanent magnets

C02F 1/481

Electromagnets (H01F 7/06):

Load engaging elements: electromagnetic means (related to H01F 7/20)

B66C 1/06

Magnet systems for NMR using electromagnets (related to H01F 7/20)

G01R 33/381

Informative references

Attention is drawn to the following places, which may be of interest for search:

Permanent magnets (H01F 7/02):

Demagnetization of permanent magnets by coils

H01F 13/006

Fastening by use of magnets (jewellery, haberdashery)

A44D 2203/00

Devices for hanging or supporting pictures, mirrors, or the like using magnetism

A47G 1/17

Magnetic cleaning implements

A47L 13/41

Magnetic dental implant retention systems

A61C 8/0081

Magnetic fastening of teeth prostheses in mouth

A61C 13/235

Toys: building blocks comprising magnetic interaction means

A63H 33/046

Magnetic mixers/stirrers

B01F 13/08

Securing wings by magnetic or electromagnetic attraction

E05C 19/16

Devices for securing together, or preventing relative movement between, constructional elements or machine parts by the use of a magnetic material

F16B 2001/0035

Electromagnetic valve actuated using a permanent magnet

F16K 31/08

Fastening of component parts of lighting devices using magnets

F21V 17/105

Supporting, suspending, or attaching arrangements for lighting: magnetic devices

F21V 21/096

Faraday rotators (magnetic field generation)

G02F 1/09

Educational appliances having elements to be mounted on a support by means of magnets

G09B 1/08

Educational appliances comprising elements to be used without a special support, the elements being connectible magnetically

G09B 1/38

Planning boards using magnetic elements

G09B 29/002

Electromagnets (H01F 7/06):

MEMS with flexible or deformable elements (related to H01F 7/08)

B81B 3/00

Valve-gear or valve arrangements actuated by electric means

F01L 9/04

Electrical control of supply of combustible mixture or its constituents: output circuits, e.g. for controlling currents in command coils (related to H01F 7/18)

F02D 41/20

Fuel injectors using electromagnetic operating means

F02M 51/061

Fuel injectors with movable windings (related to H01F 7/066)

F02M 51/0696

Control or regulating systems: automatic controllers (related to H01F 7/18)

G05B 11/00

Magnetic circuit arrangements for electromagnetic relays (related to H01F 7/081)

H01H 50/16

Electromagnetic relays in general

H01H 51/00

Actuators based on magnetostriction

H01L 41/12

Motors with reciprocating/oscillating/vibrating magnet/armature/coil

H02K 33/00

Propulsion systems (e.g. linear motors)

H02K 41/00

Acoustic electromechanical transducers having coils or permanent magnets

H04R

Special rules of classification

Although magnets are normally classified in the respective subgroups of an application when provided for, the presence of features for which an appropriate subgroup does not exist in the application main group but in H01F 7/00, requires the respective subgroup in H01F 7/00 to be allocated.

For example, an electromagnetically actuated valve which is normally classified in F16K 31/06, should also be classified in H01F 7/10 for details concerning the use of alternating current for powering the actuator.

Thin magnetic films, e.g. of one-domain structure (magnetic record carriers G11B 5/00; thin-film magnetic stores G11C)
Definition statement

This place covers:

Hard and soft ferromagnetic thin films. Antiferromagnetic thin films. Single layers and (spin-exchanged coupled) multilayers are both considered as thin films.

Thin film materials cover metallic materials, compounds or organic materials.

H01F 10/00 is concerned with ferromagnetic or antiferromagnetic materials in the form of thin films.

A thin film is generally less than a couple of microns thick and can be defined as being manufactured by the methods classified in subgroups H01F 41/18-H01F 41/34.

H01F 10/002 covers antiferromagnetic, single layer, thin films.

H01F 10/005 covers organic or organo-metallic thin films. Graphene thin films are also given this symbol in case magnetic properties are claimed.

H01F 10/007 covers granular thin films.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Measuring magnetic variables: magnetoresistive sensors (related to H01F 10/324)

G01R 33/093

Magnetic recording heads (related to H01F 10/324)

G11B 5/127

Informative references

Attention is drawn to the following places, which may be of interest for search:

Alloys based on Ni; alloys based on Co (related to H01F 10/14; H01F 10/16)

C22C 19/00

Ferrous alloys (related to H01F 10/14)

C22C 38/00

Amorphous alloys and related processes (related to H01F 10/13)

C22C 45/00

Single crystal growth of garnets (related to H01F 10/24)

C30B 29/28

Magneto-optic materials (related to H01F 10/24)

G02F 1/0036

Semiconductor devices with potential-jump barrier or surface barrier controllable by variation of the magnetic field applied to the devices, e.g. spin (valve) transistor, spin injection device (related to H01F 10/324, H01F 10/1936)

H01L 29/82

Devices using magnetic effects; Selection of materials for(related to H01F 10/324 )

H01L 43/00, H01L 43/10

characterised by the coupling or physical contact with connecting or interacting conductors
Definition statement

This place covers:

Thin films characterised by contact with conductors.

characterised by magnetic layers ({H01F 10/32 takes precedence } ; applying thin magnetic films to substrates H01F 41/14)
Definition statement

This place covers:

Single layer thin films characterised by properties or composition.

characterised by the composition
Definition statement

This place covers:

Metallic single layer thin films characterised by their composition, e.g. amorphous, crystalline.

being compounds
Definition statement

This place covers:

Compounds single layer thin films characterised by their composition. Further divided in amorphous, magnetic semiconductors, half-metals (Heusler), perovskites and ferrites.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Photonic crystals

G02B 6/1225

Magneto-optic devices (Faraday-rotator)

G02F 1/09

characterised by the substrate or intermediate layers {(H01F 10/06 and H01F 10/32 take precedence)}
Definition statement

This place covers:

Multilayers characterised by intermediate layers.

H01F 10/30 covers specific seed, template and cap layers.

Spin-exchange-coupled multilayers, e.g. nanostructured superlattices {(applying spin-exchange-coupled multilayers to substrates H01F 41/302)}
Definition statement

This place covers:

Spin-exchanged-coupled multilayers characterised by the interaction between the different layers and refined by composition of the single interacting layers.

Special rules of classification

Multilayers with perpendicular magnetic anisotropy of the type of (Co/Pt)n are also classified in H01F 10/3236 but H01F 10/3286 takes precedence.

{Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer}
Definition statement

This place covers:

Spin-exchanged-coupled multilayers characterised by having a thin non-magnetic spacer between magnetic layers.

Typical TMR and GMR structures.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Magnetic record carriers

G11B 5/00

Magnetic storage elements, non volatile memories, MRAM

G11C 11/15, G11C 11/16

Informative references

Attention is drawn to the following places, which may be of interest for search:

Magnetostrictive devices;

H01L 41/12

Selection of materials therefor

H01L 41/20

Special rules of classification

Tunnel magnetic junctions (a tunnel barrier sandwiched between two magnetic layers) are classified in H01F 10/3254.

However TMR junctions with additional pinning of one of the magnetic layers (by an AF layer or a SAF/AAF multilayer) do not have a subgroup of H01F 10/3254 where they can be classified. Therefore an Indexing Code of H01F 10/3268-H01F 10/3281 is generally additionally given.

Spin valves (GMR structures) with no specificity of the magnetic layers are generally classified under H01F 10/325.

If no subgroup in H01F 10/00 can reflect the invention of a product claim for a spin-exchanged-coupled multilayer, subgroup from the corresponding method subgroups H01F 41/302-H01F 41/309 is assigned when appropriate.

Apparatus or processes for magnetising or demagnetising ({devices for holding workpieces using magnetic or electric force acting directly on the workpieces B23Q 3/15} ; for degaussing ships B63G 9/06; for clocks or watches G04D 9/00; {recording or erasing of information on magnetic record carriers G11B 5/00} ; demagnetising arrangements for colour television H04N 9/29)
Definition statement

This place covers:

Apparatus or processes for magnetising permanent magnets or for demagnetising magnetic bodies.

References
Limiting references

This place does not cover:

Apparatus or processes for degaussing ships

B63G 9/06

Demagnetising devices for clocks or watches

G04D 9/00

Recording or erasing of information on magnetic record carriers

G11B 5/00

Demagnetizing arrangements for colour televisions

H04N 9/29

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Imparting anisotropy to permanent magnet material (e.g. aligning magnetic grains in a magnetic field)

H01F 41/0273

Fixed inductances of the signal type (coils in general H01F 5/00 {inductors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof and multistep manufacturing processes therefor H01L 28/10})
Definition statement

This place covers:

Inductances of fixed value not used /useable for high power.

Further information:

"Signal type" means that these inductances are not used/useable for high power.

References
Limiting references

This place does not cover:

Coils in general

H01F 5/00

Fixed inductances used/usable for high power

H01F 37/00

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Adaptations of transformers for special applications or functions

H01F 38/00

Inductive arrangements for semiconductor devices not otherwise provided for (related to H01F 17/0006)

H01L 23/645

Inductors for integrated circuits and corresponding multistep methods of manufacture (related to H01F 17/0006)

H01L 28/10

Loop aerials with ferromagnetic core (related to H01F 17/04)

H01Q 7/06

Impedance networks

H03H

Printed circuits incorporating printed inductors (related to H01F 17/0006)

H05K 1/165

Informative references

Attention is drawn to the following places, which may be of interest for search:

Inductive arrangements or effects between of or between wiring layers of semiconductor devices (related to H01F 17/0006)

H01L 23/5227

Integrated circuits comprising only passive thin-film elements (related to H01F 17/0006)

H01L 27/01

Thin- or thick-film solid state devices (related to H01F 17/0006)

H01L 49/02

Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "inductance" and "inductor, choke, reactor, reactance"
Fixed transformers or mutual inductances of the signal type (H01F 36/00 takes precedence)
Definition statement

This place covers:

Transformers or coupled inductances.

Further information:

"Signal type" means that these transformers or inductances are not used/useable for high power.

The subgroups basically define different frequency ranges.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Transformers with superconductive windings

H01F 36/00

Adaptations of transformers or inductances for special applications or functions

H01F 38/00

Variable inductances or transformers of the signal type (H01F 36/00 takes precedence)
Definition statement

This place covers:

Transformers or inductances which are variable and not used/useable for high power.

Further information:

  • "Signal type" means that these transformers or inductances are not used/useable for high power.
References
Limiting references

This place does not cover:

Variable inductances/transformers not being of the signal type (i.e. variable inductances/transformers used/usable for high power)

H01F 29/00

Transformers with superconductive windings

H01F 36/00

Magnetic amplifiers

H03F

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Adaptations of transformers or inductances for special applications or functions

H01F 38/00

Means for converting output of a sensing member to another variable: varying inductance

G01D 5/20

Informative references

Attention is drawn to the following places, which may be of interest for search:

Variable inductances including MEMS (related to H01F 21/04 or H01F 21/06)

B81B 3/00

Details of transformers or inductances, in general
Definition statement

This place covers:

Constructional features of transformers or inductances in general.

Further information:

In this group no distinction is made between "signal type" and "power type" applications except for the cases mentioned below. "Power type" means that these transformers or inductances are used/useable for high power.

H01F 27/00 covers constructional features of transformers and inductances falling under the titles of H01F 17/00 - H01F 21/00 and H01F 29/00 - H01F 38/00. If a subgroup for a specific detail exists under H01F 17/00 - H01F 21/00 and H01F 29/00 - H01F 38/00, this subgroup takes precedence over H01F 27/00.

H01F 27/00 also covers details of cores, coils and magnetising arrangements in H01F 3/00 - H01F 7/00 and H01F 13/00 if there is no appropriate subgroup for the respective constructional features in the H01F 3/00 - H01F 7/00 and H01F 13/00.

  • Example: cooling of coils: For superconducting coils (H01F 6/00), there is a subgroup for cooling covered by H01F 6/04. For normal-conducting coils, however, which are classified generally in H01F 5/00 and in H01F 7/20 when used as electromagnet, no subgroups for cooling exist. Therefore, applications related to the cooling of normal-conducting coils or electromagnets, in addition to H01F 5/00 or H01F 7/20, have to be classified in an appropriate subgroup of H01F 27/08.
  • Although in general, no difference is made between "signal type" and " power type" applications in H01F 27/00, this is not true for the mounting of transformers/inductances; H01F 27/027 covers the mounting of "signal type" applications; H01F 27/06 covers the mounting of "power type" applications.
  • Details related to cooling: Cooling arrangements only for coils are covered by H01F 27/2876; Cooling channels in the insulation of coils are covered by H01F 27/322; Cooling of transformers/inductances, in general, is covered by H01F 27/08 and subgroups; H01F 27/14 covers a wide variety of accessories used for oil-cooled transformers/inductances like oil expansion chambers, gas cushions, oil filters.
  • Details related to encapsulation: Devices encapsulated as a whole are covered by H01F 27/022; Encapsulation only of a winding is covered by H01F 27/327.
  • Details related to electric/magnetic shields: Shields in general are covered by H01F 27/36; Shields of the winding arrangement are covered by H01F 27/288; Shields of pancake coils are covered by H01F 27/2871.
References
Limiting references

This place does not cover:

Cooling of superconducting coils (related to H01F 27/08)

H01F 6/04

Informative references

Attention is drawn to the following places, which may be of interest for search:

Buchholz relays (for protecting oil-cooled transformers, related to H01F 27/14 and H01F 27/402)

H01H 33/555

Buchholz relays (for protecting oil-cooled transformers, related to H01F 27/14 and H01F 27/402)

H02H 5/08

Emergency protective circuits for transformers (related to H01F 27/402)

H02H 7/04

Arrangements for controlling transformers, reactors or choke coils for the purpose of obtaining a desired output (field not active anymore)

H02P 13/00

Cooling of electrical devices in general (related to H01F 27/08)

H05K 7/20

Variable transformers or inductances not covered by group H01F 21/00 {(tap change devices H01H 9/0005)}
Definition statement

This place covers:

Variable transformers or inductances of the "power type", i.e. used/useable for high power.

References
Limiting references

This place does not cover:

Variable transformers or inductances of the signal type

H01F 21/00

Details of tap change devices regarding the construction, opening mechanism and contact arrangement of the selector switches (related to H01F 29/02)

H01H 9/0005

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Adaptations of transformers or inductances for special applications or functions

H01F 38/00

Use of variable transformers or inductances in automatic systems for regulating voltage or current

G05F 1/10

Amplitude modulation by means of variable impedance element (related to H01F 29/14)

H03C 1/08

Magnetic amplifiers (related to H01F 29/14)

H03F

Fixed transformers not covered by group H01F 19/00
Definition statement

This place covers:

Fixed transformers of the "power type", i.e. used/useable for high power.

Further information:

  • The subgroups define different general transformer structures.
References
Limiting references

This place does not cover:

Fixed transformers of signal type

H01F 19/00

Transformers with superconductive windings

H01F 36/00

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Adaptations of transformers for special applications or functions

H01F 38/00

Transformers with superconductive windings or with windings operating at cryogenic temperature (superconducting magnets or superconducting coils H01F 6/00)
Definition statement

This place covers:

Transformers with superconducting windings.

Transformers with windings operating at cryogenic temperature.

References
Limiting references

This place does not cover:

Superconducting magnets or coils

H01F 6/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Cooling of transformers in general

H01F 27/08

Fixed inductances not covered by group H01F 17/00
Definition statement

This place covers:

Fixed inductances of "power type", i.e. used/useable for high power.

References
Limiting references

This place does not cover:

Fixed inductances of signal type

H01F 17/00

Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Adaptations of inductances for special applications or functions

H01F 38/00

Impedance networks

H03H

Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "inductance" and "inductor, choke, reactor, reactance"
Adaptations of transformers or inductances for specific applications or functions
Definition statement

This place covers:

Transformers or inductances for specific applications or functions.

Welding transformers and discharge lamp ballasts are covered by H01F 38/08

even if they do not explicitly have a high leakage (i.e. gap in magnetic flux path).

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Rotary transformer for transmission of signals and/or power between stationary and moving part of an X-ray computed tomography (CT) apparatus (related to H01F 38/18)

A61B 6/56

Current collectors for power supply lines of electronically propelled vehicles without mechanical contact between collector and power supply line (related to H01F 38/14)

B60L 5/005

Charging electric vehicles by inductive power transfer (related to H01F 38/14)

B60L 53/12

For wireless supply or distribution of electric power using inductive coupling

H02J 50/10

Near field transmission systems using inductive coupling (related to H01F 38/14)

H04B 5/0075

Ignition circuits for discharge lamps (related to H01F 38/10 and H01F 38/12)

H05B 41/00

Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
Definition statement

This place covers:

Apparatus or processes for manufacturing or assembling transformers, inductances, reactors or choke coils.

Apparatus or processes for manufacturing or assembling magnetic circuits, permanent magnets or coils.

Apparatus or processes for applying magnetic films to substrates and forming magnetic nanostructures.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Manufacturing articles from powder; (related to H01F 41/0246)

B22F 3/00, B22F 7/00

{Impregnating or encapsulating (insulating of windings H01F 41/12)}
Definition statement

This place covers:

Methods for encapsulating/impregnating. Refers to cases where a whole device (e.g. coil and core of a transformer or a choke) is encapsulated.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Injection moulding incorporating preformed parts

B29C 45/14

Special rules of classification

Encapsulation only of a winding is to be classified in H01F 41/127.

for manufacturing cores, coils, or magnets (H01F 41/14 takes precedence; for dynamo-electric machines H02K 15/00)
Definition statement

This place covers:

Manufacturing of hard or soft magnetic articles. Manufacturing of coils.

{Manufacturing of magnetic cores by mechanical means (magnetic cores per se H01F 27/24)}
Definition statement

This place covers:

Methods and apparatus for manufacturing soft magnetic articles characterised by the shape of the magnetic material composing those articles. H01F 41/14 takes precedence.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Manufacturing of coils, cores or magnets for dynamo-electric machines

H02K 15/00

{for manufacturing permanent magnets}
Definition statement

This place covers:

Methods and apparatus for manufacturing permanent magnets characterised by process steps performed on the magnetic material or on the magnets.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Manufacturing of coils, cores or magnets for dynamo-electric machines

H02K 15/00

for manufacturing coils {(coils for transformer or inductances H01F 27/28)}
Definition statement

This place covers:

Methods and apparatus for manufacturing coils.

Further information:

The most important subgroups are related to:

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Manufacturing of coils cores or magnets for dynamo-electric machines

H02K 15/00

Coil winding
Definition statement

This place covers:

Processes or apparatus for manufacturing coils by winding.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Winding or coil filamentary material

B65H 54/00

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Former

Frame, e.g. composed of electrically insulating material, around which a coil is wound. Examples of former are bobbins, spools or winding supports

with insulation
Definition statement

This place covers:

Processes or apparatus for winding flat conductive wires or sheets with insulation.

To be classified here, the conductive wires or sheets and the insulation must initially be separate, and must be wound simultaneously.

The figure below is an example of material classified in this subgroup. In the figure, the conductive sheet 40 and the insulating sheet 52 are wound simultaneously to form an insulated coil.

media0.png

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Insulation of windings

H01F 5/06

Insulating of coils, windings, or parts thereof

H01F 27/32

Winding non-flat conductive wires with insulation

H01F 41/066

Insulation of windings

H01F 41/12

with insulation
Definition statement

This place covers:

Processes or apparatus for winding non-flat conductive wires with insulation.

To be classified here, the conductive wires or sheets and the insulation must initially be separate and must be wound simultaneously.

The figure below is an example of material classified in this subgroup. In the figure, for example, the conductive wire 24 and the insulation tapes 21 and 22 are wound simultaneously to form an insulated coil.

media1.png

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Insulation of windings

H01F 5/06

Insulating of coils, windings, or parts thereof

H01F 27/32

Winding flat conductive wires or sheets with insulation

H01F 41/063

Insulation of windings

H01F 41/12

Forming taps or terminals while winding, e.g. by wrapping or soldering the wire onto pins, or by directly forming terminals from the wire
Definition statement

This place covers:

Processes or apparatus for forming taps or terminals while, or in conjunction with winding.

The figure below is an example of material classified in this subgroup. In the figure, the first terminal 3 is wrapped, then the first section 9 of the bobbin 1 is wound. The wire is then wrapped around the second terminal 5. The terminal connections are thus formed in conjunction with the winding of the bobbin.

media2.png

Deforming the cross section or shape of the winding material while winding
Definition statement

This place covers:

Processes or apparatus for deforming the cross section or shape of the winding material in conjunction with winding.

The figure below is an example of material classified in this subgroup. In the figure, the circular material wire 50 is transformed into the deformed rectangular wire 52 just before winding.

media3.png

Measuring electrical characteristics while winding
Definition statement

This place covers:

Processes or apparatus for winding coils while measuring electrical characteristics, e.g. resistance, inductance or capacitance.

The figure below is an example of material classified in this subgroup. In the figure, the existence of an electrical short circuit is detected by measuring voltage during winding.

media4.png

for applying magnetic films to substrates
Definition statement

This place covers:

Thin films deposition methods not provided in subgroups below.

References
Application-oriented references

Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Manufacturing record carriers

G11B 5/84

Informative references

Attention is drawn to the following places, which may be of interest for search:

Covering metals, or materials with metals

C23C

the magnetic material being applied in the form of particles, e.g. by serigraphy {, to form thick magnetic films or precursors therefor} (H01F 41/18 {-H01F 41/24} take precedence)
Definition statement

This place covers:

Deposition methods and apparatus for forming thick magnetic films, usually performed by macroscopic methods.

The obtained material is a thick magnetic film or any precursor of thick magnetic film, generally in the form of magnetisable pastes, inks or glass frits.

References
Limiting references

This place does not cover:

Cathode sputtering

H01F 41/18

Evaporation

H01F 41/20

Heat treatment, thermal decomposition, Chemical vapour deposition

H01F 41/22

Using liquids to apply magnetic films

H01F 41/24

Informative references

Attention is drawn to the following places, which may be of interest for search:

Thick films and precursors thereof

H01F 1/0027

by cathode sputtering
Definition statement

This place covers:

Deposition methods and apparatus for forming thin magnetic films characterised by deposition methods.

Heat treatment; Thermal decomposition; Chemical vapour deposition
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Coating by evaporation or sputtering

C23C 14/00

from liquids
Definition statement

This place covers:

Deposition from liquids.

H01F 1/26 covers deposition from liquids using electric currents.

H01F 1/28 covers deposition from liquids by liquid phase epitaxy.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Electrodeposition

C25D 3/00, C25D 5/00

for applying nanostructures, e.g. by molecular beam epitaxy [MBE]
Definition statement

This place covers:

Deposition methods and apparatus for forming multilayered nanostructures, especially spin-exchange-coupled multilayers corresponding to product subgroups H01F 10/324-H01F 10/3295, characterised by specific process steps leading to a specific change of properties of the grown superlattice (H01F 41/303-H01F 41/304) or to a given structure (H01F 41/305-H01F 41/309).

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Ion implantation

C23C 14/48

for applying conductive, insulating or magnetic material on a magnetic film {, specially adapted for a thin magnetic film}
Definition statement

This place covers:

Deposition methods and apparatus for applying a single layer on a magnetic thin film characterised by specific process steps.

H01F 41/34 covers deposition in patterns (i.e. using lithography).

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Ion implantation

C23C 14/48

Special rules of classification

Spin filters capping layers for TMR/GMR structures (products) are also classified within method subgroup H01F 41/325.