公开(公告)号：US11585013B2

公开(公告)日：2023-02-21

申请号：US16758915

申请日：2018-10-24

Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ALABAMA ,  TDK CORPORATION

Inventor： Takao Suzuki ,  Tim Mewes ,  Gary Mankey ,  Isao Kanada ,  Yusuke Ariake

IPC: C30B29/52 ,  C30B29/16 ,  C30B23/02 ,  B32B15/01 ,  H01F1/147 ,  C22C38/10 ,  C22C38/06 ,  C23C14/35 ,  C23C14/18 ,  C22C5/04 ,  C22C30/00 ,  C23C14/34 ,  B32B15/04 ,  C23C28/02 ,  C23C30/00 ,  B32B15/18 ,  C22C19/07 ,  B32B15/20

Abstract: An Fe—Co—Al alloy magnetic thin film contains, in terms of atomic ratio, 20% to 30% Co and 1.5% to 2.5% Al. The Fe—Co—Al alloy magnetic thin film has a crystallographic orientation such that the (100) plane is parallel to a substrate surface and the direction is perpendicular to the substrate surface. The Fe—Co—Al alloy magnetic thin film has good magnetic properties, that is, a magnetization of 1440 emu/cc or more, a coercive force of less than 100 Oe, a damping factor of less than 0.01, and an FMR linewidth ΔH at 30 GHz of less than 70 Oe.

公开(公告)号：US11515854B2

公开(公告)日：2022-11-29

申请号：US16725581

申请日：2019-12-23

Applicant: TDK Corporation

Inventor： Yoshihiro Shinkai ,  Yuichiro Okuyama ,  Yusuke Ariake ,  Tomoya Hanai ,  Isao Kanada ,  Takashi Ohtsuka

IPC: H03H7/01 ,  H01F17/00 ,  H01F27/29 ,  H05K1/18 ,  H03H1/00

Abstract: An LC composite component includes a magnetic substrate with magnetism, a magnetic layer with magnetism, inductors, capacitors, and core parts with magnetism. The magnetic substrate includes a first surface and a second surface on a side opposite to the first surface. The magnetic layer is disposed to face the first surface of the magnetic substrate. The inductors and the capacitors are disposed between the first surface of the magnetic substrate and the magnetic layer. The core parts are disposed between the first surface of the magnetic substrate and the magnetic layer and connected to the magnetic layer. The thickness of the core part is 1.0 or more times the thickness of the magnetic layer, the thickness of the magnetic substrate is 1.0 or more times the thickness of the magnetic layer.

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.

公开(公告)号：US20200058429A1

公开(公告)日：2020-02-20

申请号：US16545517

申请日：2019-08-20

Applicant: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ALABAMA ,  TDK CORPORATION

Inventor： Takao Suzuki ,  Tim Mewes ,  Gary Mankey ,  Claudia Mewes ,  Kyotaro Abe ,  Isao Kanada ,  Yusuke Ariake

IPC: H01F10/16 ,  C30B29/16 ,  C30B23/02 ,  C30B29/52 ,  C23C14/18 ,  C22C38/10 ,  C22C38/02

Abstract: An Fe—Co—Si alloy magnetic thin film contains, in terms of atomic ratio, 20% to 25% Co and greater than 0% to 20% Si. The Fe—Co—Si alloy magnetic thin film primarily has a body-centered cubic crystal structure. Among three directions of the crystal structure, one of the three directions is perpendicular to a substrate surface and the other two directions are parallel to the substrate surface. The Fe—Co—Si alloy magnetic thin film deposited onto MgO (100) has suitable magnetic properties, that is, a high magnetization of 1100 to 1725 emu/cc, a coercive force of less than 95 Oe, and an effective damping parameter of less than 0.001.

公开(公告)号：US10109403B2

公开(公告)日：2018-10-23

申请号：US14909563

申请日：2014-08-08

Applicant: TDK CORPORATION

Inventor： Isao Kanada ,  Hiroyuki Ono ,  Eiji Kato ,  Masashi Miwa

IPC: H01F1/057 ,  H01F1/055 ,  C22C38/00 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  H02K1/02 ,  H01F41/02

Abstract: The present invention provides an R-T-B based sintered magnet that inhibits the demagnetization rate at high temperature even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The R-T-B based sintered magnet comprises R2T14B crystal grains and two-grain boundary parts between the R2T14B crystal grains. Two-grain boundary parts formed by a phase containing R, Cu, Co, Ga and Fe with a ratio of 40≤R≤70, 1≤Co≤10, 5≤Cu≤50, 1≤Ga≤15, and 1≤Fe≤40 (wherein, R+Cu+Co+Ga+Fe=100, and R is at least one selected from rare earth elements) exists in the magnet.

公开(公告)号：US11682510B2

公开(公告)日：2023-06-20

申请号：US16792956

申请日：2020-02-18

Applicant: TDK Corporation

Inventor： Isao Kanada ,  Yu Yonezawa

IPC: H01F1/24 ,  H01F1/33 ,  H01F3/08 ,  H01F1/20 ,  H01F1/12 ,  H01F1/44 ,  H01F1/26 ,  H01F17/00 ,  H01F17/04 ,  H01F1/22

CPC classification number: H01F1/24 ,  H01F1/12 ,  H01F1/20 ,  H01F1/33 ,  H01F3/08 ,  H01F1/22 ,  H01F1/26 ,  H01F1/442 ,  H01F17/0013 ,  H01F2017/048

Abstract: A composite magnetic material includes a powder and a resin. The powder has a main component containing Fe or Fe and Co. An average minor axis length in primary particles of the powder is 100 nm or less. A point satisfying (X, Y)=(σ/Av (%), (Av-σ)) on an XY coordinate plane is present within a region (including a boundary) surrounded by three points α(24.5, 6.7), β(72.0, 1.2), and γ(24.5, 1.2), in which an average of aspect ratios in the primary particles of the powder is set to Av, and a standard deviation of the aspect ratios in the primary particles of the powder is set to σ.

公开(公告)号：US11456097B2

公开(公告)日：2022-09-27

申请号：US16295074

申请日：2019-03-07

Applicant: TDK Corporation

Inventor： Yusuke Ariake ,  Isao Kanada

IPC: H01F1/147 ,  H01F1/34 ,  H01F1/24 ,  H01F1/28

Abstract: The present invention provides a composite magnetic body comprising metal particles containing Fe or Fe and Co as a main component and a resin, wherein an average major axis diameter of the metal particles is 30 to 500 nm, an average of the aspect ratios of the metal particles is 1.5 to 10, and a CV value of the aspect ratios is 0.40 or less.

公开(公告)号：US10410777B2

公开(公告)日：2019-09-10

申请号：US14906732

申请日：2014-08-08

Applicant: TDK Corporation

Inventor： Isao Kanada ,  Masashi Miwa ,  Haruna Nakajima ,  Eiji Kato

IPC: H01F1/059 ,  B22F1/00 ,  C22C38/00 ,  H01F1/057 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  H02K1/02 ,  H02K1/27 ,  H01F41/02

Abstract: An R-T-B based sintered magnet has excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B grains, wherein, an R—Cu-M-C concentrated part is existed in a grain boundary formed between or among two or more adjacent R2T14B grains, and the concentrations of R (R is at least one from Sc, Y and the lanthanoide element), Cu, M (M is at least one from Ga, Si, Sn, Ge and Bi) and C in the R—Cu-M-C concentrated part are higher than those in the R2T14B grains respectively.

公开(公告)号：US11328872B2

公开(公告)日：2022-05-10

申请号：US16724760

申请日：2019-12-23

Applicant: TDK CORPORATION

Inventor： Yoshihiro Shinkai ,  Yuichiro Okuyama ,  Tomoya Hanai ,  Yusuke Ariake ,  Isao Kanada ,  Takashi Ohtsuka

IPC: H01G4/40 ,  H01F27/24 ,  H01F27/28 ,  H01F27/40

Abstract: An LC composite component includes a non-magnetic substrate, a magnetic layer with magnetism, capacitors, inductors, and core parts with magnetism. The non-magnetic substrate includes a first surface and a second surface on a side opposite to the first surface. The magnetic layer is disposed to face the first surface of the non-magnetic substrate. The inductors and the capacitors are disposed between the first surface of the non-magnetic substrate and the magnetic layer. The core parts are disposed between the first surface of the non-magnetic substrate and the magnetic layer and connected to the magnetic layer. The thickness of the core parts is 1.0 or more times the thickness of the magnetic layer in a direction perpendicular to the first surface of the non-magnetic substrate, and each of the magnetic layer and the core parts contains magnetic metal particles and resin.

公开(公告)号：US10388441B2

公开(公告)日：2019-08-20

申请号：US14909606

申请日：2014-08-08

Applicant: TDK CORPORATION

Inventor： Isao Kanada ,  Hiroyuki Ono ,  Eiji Kato ,  Masashi Miwa

IPC: H01F1/055 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  H01F1/057

Abstract: The present invention provides an R-T-B based sintered magnet that inhibits the demagnetization rate at high temperature even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The R-T-B based sintered magnet includes R2T14B crystal grains and two-grain boundary parts between the R2T14B crystal grains. Two-grain boundary parts formed by R—Co—Cu-M-Fe phase exist, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi.