US 11,798,738 B2
Magnetic powder, method for producing magnetic powder, powder magnetic core, and coil part
Momo Tadai, Suwa (JP); and Takuya Miyakawa, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jul. 24, 2020, as Appl. No. 16/938,001.
Claims priority of application No. 2019-136813 (JP), filed on Jul. 25, 2019.
Prior Publication US 2021/0027940 A1, Jan. 28, 2021
Int. Cl. H01F 41/02 (2006.01); H01F 1/24 (2006.01); H01F 1/33 (2006.01); H01F 17/06 (2006.01); H01F 27/28 (2006.01); H01F 27/32 (2006.01); H01F 27/255 (2006.01)
CPC H01F 41/0246 (2013.01) [H01F 1/24 (2013.01); H01F 1/33 (2013.01); H01F 17/062 (2013.01); H01F 27/255 (2013.01); H01F 27/2823 (2013.01); H01F 27/32 (2013.01); Y10T 428/32 (2015.01)] 12 Claims
OG exemplary drawing
 
1. A magnetic powder, comprising:
a core portion containing a soft magnetic material;
a foundation layer that is provided at a surface of the core portion, that contains an oxide of the soft magnetic material, and that has an average thickness of 0.1 nm or more and less than 10 nm; and
an insulating layer that is provided at a surface of the foundation layer, and that contains an organosiloxane compound as a main material,
wherein the organosiloxane compound has a C/Si atomic ratio of 0.01 or more and 2.00 or less, and
a ratio of a relative permittivity of the insulating layer to an average thickness of the insulating layer is 0.033/nm or more and 3.2/nm or less.