	US 11,682,510 B2
	Composite magnetic material, magnetic core, and electronic component
Isao Kanada, Tokyo (JP); and Yu Yonezawa, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK Corporation, Tokyo (JP)
Filed on Feb. 18, 2020, as Appl. No. 16/792,956.
Claims priority of application No. JP2019-029552 (JP), filed on Feb. 21, 2019; and application No. JP2019-234932 (JP), filed on Dec. 25, 2019.
Prior Publication US 2020/0273610 A1, Aug. 27, 2020
Int. Cl. H01F 1/24 (2006.01); H01F 1/33 (2006.01); H01F 3/08 (2006.01); H01F 1/20 (2006.01); H01F 1/12 (2006.01); H01F 1/44 (2006.01); H01F 1/26 (2006.01); H01F 17/00 (2006.01); H01F 17/04 (2006.01); H01F 1/22 (2006.01)

CPC H01F 1/24 (2013.01) [H01F 1/12 (2013.01); H01F 1/20 (2013.01); H01F 1/33 (2013.01); H01F 3/08 (2013.01); H01F 1/22 (2013.01); H01F 1/26 (2013.01); H01F 1/442 (2013.01); H01F 17/0013 (2013.01); H01F 2017/048 (2013.01)]

13 Claims

1. A composite magnetic material comprising

a powder and a resin,

wherein the powder has a main component containing Fe or Fe and Co,

an average minor axis length in primary particles of the powder is 18.6 nm or more and 94 nm or less, and

a point satisfying (X, Y)=(σ/A_v(%), (A_v-σ)) on an XY coordinate plane is present within a region (including a boundary) surrounded by seven points (24.7, 3.4), (27.4, 6.2), (67.8, 1.6), (68.3, 1.4), (32.6, 1.6), (28.6, 2.3), and (26.0, 3.0),

in which an average of aspect ratios in the primary particles of the powder is set to A_v, and a standard deviation of the aspect ratios in the primary particles of the powder is set to σ.