公开(公告)号：US10854376B2

公开(公告)日：2020-12-01

申请号：US16013657

申请日：2018-06-20

Applicant: TDK CORPORATION

Inventor： Akihiro Harada ,  Yoshihiro Shinkai ,  Kyohei Takahashi ,  Tomoya Hanai

IPC: H01F27/40 ,  H01F1/33 ,  H01G4/40 ,  H03H7/01 ,  H03H1/00 ,  H01F27/28 ,  H01F27/255 ,  H01F17/00 ,  H01F27/29 ,  H01G4/30 ,  H01G4/248

Abstract: A coil component includes a coil and a composite magnetic material containing magnetic particles. The magnetic particles have an average minor-axis length of more than 5.0 nm and 50 nm or less and an average aspect ratio of 2.0 or more and 10.0 or less. The magnetic particles are orientated substantially perpendicularly to a central axis of the coil and are orientated randomly within a perpendicular plane to the central axis of the coil. The composite magnetic material has a saturation magnetization σs of 80.0 emu/g or more.

公开(公告)号：US11424059B2

公开(公告)日：2022-08-23

申请号：US16360269

申请日：2019-03-21

Applicant: TDK Corporation

Inventor： Kyohei Takahashi ,  Isao Kanada

IPC: H01F1/26 ,  H01F1/33 ,  H01F1/34 ,  H01F1/147 ,  B22F1/102 ,  B22F3/11 ,  C22C38/00

Abstract: The present invention provides a composite magnetic body comprising metal particles containing Fe or Fe and Co as a main component, a resin, and voids, wherein an average major axis diameter of the metal particles is 30 to 500 nm, an average aspect ratio of the metal particles is 1.5 to 10, and in a cross section of the composite magnetic body, a percent presence of the voids is 0.2 to 10 area % and an average equivalent circle diameter of the voids is 1 μm or less, and a saturation magnetization of the composite magnetic body is 300 to 600 emu/cm3.