公开(公告)号：US20190304644A1

公开(公告)日：2019-10-03

申请号：US16295074

申请日：2019-03-07

Applicant: TDK Corporation

Inventor： Yusuke ARIAKE ,  Isao KANADA

IPC: H01F1/147 ,  H01F1/34

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：US20160180993A1

公开(公告)日：2016-06-23

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 ,  C22C38/06 ,  C22C38/00 ,  C22C38/16 ,  C22C38/10

CPC classification number: H01F1/0577 ,  B22F2998/10 ,  B22F2999/00 ,  C22C38/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0551 ,  H01F41/0293 ,  H02K1/02 ,  B22F3/087 ,  B22F2202/05 ,  B22F9/023 ,  B22F9/04 ,  B22F3/1007 ,  B22F3/1028 ,  B22F2201/20

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.

Abstract translation: 本发明提供一种即使在使用较少或不重稀土元素如Dy，Tb等的情况下也能抑制高温退磁速度的R-T-B系烧结磁体。 R-T-B系烧结磁体包括R2T14B晶粒和R2T14B晶粒之间的两晶界面部分。 由含有R，Cu，Co，Ga和Fe的相组成的具有40和nlE的相的两晶边界部分; R＆lt; E; 70,1＆amp; NlE; Co＆NlE; 10，5＆amp; N; Cu＆NlE; 50,1和nlE; Ga和nlE; 15和1＆ Fe（n）; 40（其中，R + Cu + Co + Ga + Fe = 100，R为选自稀土元素中的至少一种）。

公开(公告)号：US20240145134A1

公开(公告)日：2024-05-02

申请号：US18175139

申请日：2023-02-27

Applicant: TDK CORPORATION

Inventor： Toshiki GUSHI ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Isao KANADA

IPC: H01F1/00 ,  G01N27/72

CPC classification number: H01F1/0054 ,  G01N27/72

Abstract: A polymer particle containing magnetic material includes a core and a polymer layer. The core includes magnetic fine particles. The polymer layer is located outside the core and surrounds the core. A shape ratio (Ric) is defined in each of the magnetic fine particles by dividing a diameter (Di) of an inscribed circle of the magnetic fine particle by a diameter (Do) of a circumscribed circle of the magnetic fine particle. The shape ratio (Ric) of the magnetic fine particle is 0.50 or more and 0.94 or less. The diameter (Di) of the magnetic fine particle is 5 nm or more. The diameter (Di) and the shape ratio (Ric) of the magnetic fine particle satisfy a relation formula of Di≤9.28×e{circumflex over ( )}(1.17×Ric).

公开(公告)号：US20240071662A1

公开(公告)日：2024-02-29

申请号：US18455842

申请日：2023-08-25

Applicant: TDK CORPORATION

Inventor： Kyohei TAKAHASHI ,  Hiroshi ITO ,  Isao KANADA

IPC: H01F1/20 ,  B22F1/054 ,  B22F1/145 ,  B22F3/02 ,  B22F9/04 ,  B22F9/30 ,  C22C19/00 ,  C22C19/07

CPC classification number: H01F1/20 ,  B22F1/054 ,  B22F1/147 ,  B22F3/02 ,  B22F9/04 ,  B22F9/30 ,  C22C19/002 ,  C22C19/007 ,  C22C19/07 ,  B22F2201/11 ,  B22F2202/01 ,  B22F2301/15 ,  B22F2304/054 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02

Abstract: The metal magnetic powder includes Co as a main component, and an average particle size (D50) of 1 nm to 100 nm. An X-ray diffraction chart of the metal magnetic powder has a first peak that appears in a range of a diffraction angle 2θ of 41.6±0.3°, and a second peak that appears in a range of a diffraction angle 20θ of 47.4±0.3°. When a full width at half maximum of the first peak is set as FW1, and a full width at half maximum of the second peak is set as FW2, a ratio (FW2/FW1) of FW2 to FW1 is 1 to 5.

公开(公告)号：US20230384298A1

公开(公告)日：2023-11-30

申请号：US18175036

申请日：2023-02-27

Applicant: TDK CORPORATION

Inventor： Yusuke ARIAKE ,  Kazuhiro YOSHIDOME ,  Isao KANADA

IPC: G01N33/543 ,  G01N27/74 ,  H01F1/20

CPC classification number: G01N33/54326 ,  G01N27/745 ,  H01F1/20

Abstract: A polymer particle containing magnetic material includes a core, an intermediate layer, and a polymer layer. The core includes magnetic fine particles having an average diameter of 5 nm or more and 30 nm or less. The intermediate layer is located outside the core and has a lower concentration of the magnetic fine particles than the core. The polymer layer covers the intermediate layer. A thickness of the intermediate layer is 5% or more and 60% or less of a radius of the polymer particle containing magnetic material.

公开(公告)号：US20200347516A1

公开(公告)日：2020-11-05

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 ,  H01F1/147 ,  B32B15/01 ,  C30B29/16 ,  C22C38/10 ,  C22C38/06 ,  C23C14/35 ,  C23C14/18 ,  C30B23/02

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：US20200082966A1

公开(公告)日：2020-03-12

申请号：US16305135

申请日：2017-05-30

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

Inventor： Takao SUZUKI ,  Tim MEWES ,  Gary J. MANKEY ,  Isao KANADA

IPC: H01F10/00 ,  H01F10/14

Abstract: An iron-based magnetic thin film comprising from 0% to 25% of aluminum in terms of atomic ratio; wherein the iron-based magnetic thin film comprises a plurality of crystals having an average crystallite size of 100 Å or less; the iron-based magnetic thin film is disposed on a surface of a substrate; and a direction of a crystal of the iron-based magnetic thin film is perpendicular to the surface of the substrate.

公开(公告)号：US20200082964A1

公开(公告)日：2020-03-12

申请号：US16494791

申请日：2018-03-30

Applicant: TDK CORPORATION

Inventor： Takeshi SAKAMOTO ,  Yoshihiro SHINKAI ,  Yu YONEZAWA ,  Hideharu MORO ,  Kensuke ARA ,  Tohru OIKAWA ,  Isao KANADA ,  Kenji HORINO ,  Kyung-Ku CHOI

IPC: H01F1/33 ,  H01F1/24 ,  H01F27/255 ,  H01F17/04 ,  H01F17/00

Abstract: A composite magnetic body with high permeability and low magnetic loss in a high-frequency region of a gigahertz band; and a high-frequency electronic component using the same, the electronic component being compact and having low-insertion loss. This composite magnetic body has a high permeability and a low magnetic loss especially in a high-frequency region of a gigahertz band, and is provided with: a plurality of magnetic nanowires 361-363 aligned so as not to cross each other; and insulators 365-367 that electrically insulate the plurality of magnetic nanowires 361-363.

公开(公告)号：US20160163434A1

公开(公告)日：2016-06-09

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 ,  C22C38/16 ,  C22C38/10 ,  H02K1/27 ,  C22C38/00 ,  C22C38/02 ,  H02K1/02 ,  B22F1/00 ,  C22C38/06

CPC classification number: H01F1/059 ,  B22F1/0003 ,  B22F2301/35 ,  B22F2998/10 ,  B22F2999/00 ,  C22C38/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  H01F1/0577 ,  H01F41/0293 ,  H02K1/02 ,  H02K1/2706 ,  B22F3/087 ,  B22F2202/05 ,  B22F3/1007 ,  B22F2201/20 ,  B22F9/023 ,  B22F9/04 ,  B22F3/1028

Abstract: The present invention provides an R-T-B based sintered magnet having 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.

Abstract translation: 本发明提供了具有优异的耐腐蚀性和良好磁性的R-T-B系烧结磁体。 RTB型烧结磁体含有R2T14B晶粒，其中R-Cu-MC浓缩部分存在于两个或更多相邻的R2T14B晶粒之间形成的晶界中，R（R为Sc， Y和镧系元素），Cu，M（M为Ga，Si，Sn，Ge和Bi中的至少一种），R-Cu-MC浓缩部分的C分别高于R2T14B晶粒。