US 11,901,104 B2
Composite magnetic material and inductor using the same
Takuya Ishida, Nagaokakyo (JP); Mikito Sugiyama, Nagaokakyo (JP); Mitsuru Odahara, Nagaokakyo (JP); Hideaki Ooi, Nagaokakyo (JP); and Koichi Ida, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Feb. 21, 2023, as Appl. No. 18/172,169.
Application 18/172,169 is a continuation of application No. 16/833,323, filed on Mar. 27, 2020, granted, now 11,631,513.
Claims priority of application No. 2019-064582 (JP), filed on Mar. 28, 2019.
Prior Publication US 2023/0207168 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01F 1/24 (2006.01); H01F 1/153 (2006.01); H01F 27/255 (2006.01); H01F 1/058 (2006.01); B22F 1/08 (2022.01); B22F 1/16 (2022.01); B22F 1/052 (2022.01); B22F 1/10 (2022.01)
CPC H01F 1/24 (2013.01) [B22F 1/052 (2022.01); B22F 1/08 (2022.01); B22F 1/16 (2022.01); H01F 1/058 (2013.01); H01F 1/15375 (2013.01); H01F 27/255 (2013.01); B22F 1/10 (2022.01); Y10T 428/32 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A composite magnetic material comprising metal magnetic particles,
the metal magnetic particles including:
first particles having a median diameter D50 of 1.3 μm to 5.0 μm, and
second particles having a median diameter D50 larger than the first particles,
wherein the first particles and the second particles each include a core portion made of a metal magnetic material, and an insulating film on a surface of the core portion,
the insulating film of the second particles has an average thickness of 40 nm to 100 nm,
an average thickness of the insulating film of the first particles is smaller than that of the insulating film of the second particles, and
at least one of the first particles or the second particles comprises a crystalline material or a crystalline phase.