US 11,682,507 B2
Coil component
Kazuhiro Yoshidome, Tokyo (JP); Hiroyuki Matsumoto, Tokyo (JP); Hitoshi Ohkubo, Tokyo (JP); and Atsuyuki Nakano, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Feb. 25, 2020, as Appl. No. 16/800,299.
Claims priority of application No. JP2019-035312 (JP), filed on Feb. 28, 2019.
Prior Publication US 2020/0279675 A1, Sep. 3, 2020
Int. Cl. H01F 1/147 (2006.01); H01F 27/245 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); H01F 1/153 (2006.01); H01F 27/25 (2006.01)
CPC H01F 1/147 (2013.01) [C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/12 (2013.01); H01F 1/15333 (2013.01); H01F 27/245 (2013.01); H01F 27/25 (2013.01); C22C 2202/02 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A coil component, comprising a coil and a magnetic core, wherein
the coil is formed inside the magnetic core,
the magnetic core has a laminated body in which soft magnetic layers are punched and laminated,
micro gaps are formed in the soft magnetic layers,
the soft magnetic layers are divided into at least two or more small pieces by the micro gaps,
the number of the small pieces into which the soft magnetic layers are divided is 2 to 50 per layer,
the number of the small pieces per unit area is 296 pieces/cm2 or more and 1000000 pieces/cm2 or less,
a structure consisting of Fe-based nano-crystals is observed in the soft magnetic layers,
the laminated body has a ΔHc calculated as a difference in coercive force before and after the soft magnetic layers are divided into small pieces and punched of 7.5 A/m or less,
the soft magnetic layers have a composition formula (Fe(1−(α+β)) X1αX2β)(1−(a+b+c+d+e+f))MaBbPcSidCeSf,
X1 is one or more elements selected from a group consisting of Co and Ni,
X2 is one or more elements selected from a group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O and rare earth elements,
M is one or more elements selected from a group consisting of Nb, Hf, Zr, Ta, Mo, W, Ti and V,
0≤a≤0.140
0.020≤b≤0.200
0≤c≤0.150
0≤d≤0.090
0≤e≤0.030
0≤f≤0.030
α≥0
β≥0
0≤α+β≤0.50, and
at least one or more of a, c and d is greater than zero.