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公开(公告)号：US11549970B2
公开(公告)日：2023-01-10
申请号：US17080958
申请日：2020-10-27
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Kenzo Makino , Hiraku Hirabayashi
Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a helical coil. The magnetoresistive effect element includes a magnetoresistive effect film extending in a first axis direction. The helical coil includes a parallel connection including first and second parts extending in a second axis direction inclined with respect to the first axis direction. The first and second parts are adjacent to each other in a third axis direction and coupled to each other in parallel. The helical coil is wound around the magnetoresistive effect element while extending along the third axis direction. The magnetoresistive effect film overlaps the first and second parts in a fourth axis direction orthogonal to the second and third axis directions. The helical coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect film in the third axis direction.
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公开(公告)号：US11422166B2
公开(公告)日：2022-08-23
申请号：US17187966
申请日：2021-03-01
Applicant: TDK CORPORATION
Inventor： Takafumi Kobayashi , Norikazu Ota , Kenzo Makino
Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a coil. The coil includes first and second tier parts opposed to each other in a first axis direction, with the magnetoresistive effect element interposed therebetween. The coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect element in a second axis direction. The first tier part includes first conductors extending in a third axis direction, arranged in the second axis direction and coupled in parallel to each other. The second tier part includes a second conductor or second conductors extending in the third axis direction, the second conductors being arranged in the second axis direction and coupled in parallel to each other. The first conductors each have a width smaller than a width of the second conductor or each of the second conductors.
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公开(公告)号：US10339965B2
公开(公告)日：2019-07-02
申请号：US15416065
申请日：2017-01-26
Applicant: TDK Corporation
Inventor： Yuki Nishimura , Norikazu Ota
Abstract: A thermally assisted magnetic recording head has a waveguide that propagates laser light as propagating light; a main pole that has a first end portion on an air bearing surface (ABS) facing a magnetic recording medium and that emits a magnetic flux to the magnetic recording medium; a metal layer that is positioned between the main pole and the waveguide, that extends from a second end portion positioned on the ABS in a height direction, that generates surface plasmons from the propagating light, and that generates near-field light (NF light) from the surface plasmons at the second end portion; and a dielectric body layer that is surrounded by the metal layer and that extends from a third end portion positioned on the ABS in a height direction.
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公开(公告)号：US09165582B1
公开(公告)日：2015-10-20
申请号：US14250522
申请日：2014-04-11
Applicant: TDK Corporation
Inventor： Shinji Hara , Eiji Komura , Norikazu Ota , Daisuke Miyauchi , Tetsuya Roppongi , Koji Shimazawa
CPC classification number: G11B13/08 , G11B5/3106 , G11B5/314 , G11B5/3163 , G11B5/6076 , G11B5/6082 , G11B5/6088 , G11B7/1387 , G11B2005/0021
Abstract: A thermal assisted magnetic recording head has a magnetic head slider having an air bearing surface that is opposite to a magnetic recording medium, a core that can propagate laser light as propagating light, a plasmon generator that includes a generator front end surface facing the air bearing surface, and a main pole facing the air bearing surface, and a laser light generator that supplies the laser light to the core. The plasmon generator generates near-field light (NF light) at the generator front end surface to heat the magnetic recording medium. The main pole includes a main pole end surface that faces the air bearing surface and that is positioned in the vicinity of the generator front end surface, and emits a magnetic flux to the magnetic recording medium from the main pole end surface. At least a portion of the laser light that is not coupled with the plasmon generator thermally deforms the air bearing surface so that a part of the air bearing surface positioned closer to the leading side than the generator front end surface and the main pole end surface in the down track direction protrudes toward the magnetic recording medium.
Abstract translation: 热辅助磁记录头具有磁头滑块，其具有与磁记录介质相反的空气轴承表面，可以传播激光作为传播光的芯，等离子体激元发生器，其包括面向空气轴承的发生器前端表面 表面和面向空气轴承表面的主极;以及激光发生器，其将激光供应到芯。 等离子体发生器在发生器前端表面产生近场光（NF光），以加热磁记录介质。 主极包括面向空气轴承表面并且位于发生器前端表面附近的主极端面，并且从主极端面向磁记录介质发射磁通量。 不与等离子体发生器耦合的激光的至少一部分使空气轴承表面发生热变形，使得空气轴承表面的一部分比发生器前端表面和主极端表面更靠近前端 向下轨道方向朝向磁记录介质突出。
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15.发明授权Thermally-assisted magnetic recording head, head gimbals assembly, head arm assembly and magnetic recording unit 有权热辅助磁记录头，头架万向节组件，头臂组件和磁记录单元公开(公告)号：US09153267B1
公开(公告)日：2015-10-06
申请号：US14276751
申请日：2014-05-13
Applicant: TDK CORPORATION
Inventor： Eiji Komura , Shinji Hara , Norikazu Ota , Tetsuya Roppongi , Kosuke Tanaka
CPC classification number: G11B5/6088 , G11B5/314 , G11B2005/0021
Abstract: A thermally-assisted magnetic recording head of the invention includes: a waveguide; a plasmon generator; and a light-absorbing protrusion layer provided on a leading side of the plasmon generator. A ratio W1/W2 is within a range from 2/3 to 55/3, where W1 is a width of the light-absorbing protrusion layer in an air-bearing surface, and W2 is a width of the waveguide in the air-bearing surface.
Abstract translation: 本发明的热辅助磁记录头包括：波导; 等离子体发生器; 以及设置在等离子发生器的前侧的吸光突起层。 比W1 / W2在2/3〜55/3的范围内，其中W1是空气轴承表面中的吸光突起层的宽度，W2是空气轴承中的波导的宽度 表面。
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Patent Agency Ranking
公开(公告)号：US12204003B2
公开(公告)日：2025-01-21
申请号：US17955819
申请日：2022-09-29
Applicant: TDK CORPORATION
Inventor： Daichi Takano , Norikazu Ota , Hiraku Hirabayashi , Kazuya Watanabe
Abstract: An MR element includes a first magnetic layer, a second magnetic layer, and a nonmagnetic layer disposed between the first magnetic layer and the second magnetic layer. The first magnetic layer has a magnetic shape anisotropy set in a first reference direction, and has a magnetization whose direction changes depending on an external magnetic field, the magnetization being oriented in a first magnetization direction in a state where the external magnetic field is not applied. The second magnetic layer has a magnetic shape anisotropy set in a second reference direction, and has a magnetization whose direction changes depending on the external magnetic field, the magnetization being oriented in a second magnetization direction in a state where the external magnetic field is not applied.
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公开(公告)号：US11959943B2
公开(公告)日：2024-04-16
申请号：US17825702
申请日：2022-05-26
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Kenzo Makino , Hiraku Hirabayashi
CPC classification number: G01R15/205 , G01R19/0092 , G01R33/091 , H01C7/00 , H01F7/064 , H01F27/28
Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a conductor. The magnetoresistive effect element includes a magnetoresistive effect film extending in a first axis direction and including a first end part, a second end part, and an intermediate part between the first and second end parts. The conductor includes a first part and a second part that each extend in a second axis direction inclined with respect to the first axis direction. The conductor is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect film in a third axis direction orthogonal to the second axis direction. The first part and the second part respectively overlap the first end part and the second end part in a fourth axis direction orthogonal to both of the second axis direction and the third axis direction.
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公开(公告)号：US11946989B2
公开(公告)日：2024-04-02
申请号：US18197913
申请日：2023-05-16
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Hiraku Hirabayashi , Kazuma Yamawaki , Shuhei Miyazaki , Kazuya Watanabe
CPC classification number: G01R33/098 , G01R33/0206 , G01R33/093
Abstract: A magnetic sensor device includes at least one magnetic sensor and a support. A center of gravity of an element layout area of the at least one magnetic sensor is deviated from a center of gravity of a reference plane of the support. The at least one magnetic sensor includes four resistor sections constituted by a plurality of magnetoresistive elements. Magnetization of a free layer in each of two of the resistor sections includes a component in a third magnetization direction. The magnetization of a free layer in each of the other two resistor sections includes a component in a fourth magnetization direction opposite to the third magnetization direction.
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公开(公告)号：US11467234B2
公开(公告)日：2022-10-11
申请号：US17084376
申请日：2020-10-29
Applicant: TDK CORPORATION
Inventor： Kenzo Makino , Norikazu Ota
Abstract: A magnetic sensor includes at least one MR element and a coil. The coil includes at least one conductor portion. The at least one conductor portion is each located at a position such that a partial magnetic field generated by the conductor portion is applied to one of the at least one MR element, the one corresponding to the conductor portion, and extends along an imaginary curve curving to protrude in a direction away from the corresponding MR element.
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公开(公告)号：US08867168B2
公开(公告)日：2014-10-21
申请号：US13708507
申请日：2012-12-07
Applicant: TDK Corporation
Inventor： Norikazu Ota , Masahiro Saito , Taro Oike , Takeo Kagami , Yosuke Antoku , Kenkichi Anagawa , Kenta Hara , Tetsuro Sasaki , Shingo Miyata , Katsuki Kurihara
CPC classification number: G11B5/1278 , G11B5/3116 , G11B5/315
Abstract: A magnetic head includes a main pole, a write shield, and a return path section. The write shield includes first and second shield portions located on opposite sides of the main pole in the track width direction. The return path section includes first and second yoke portions located on opposite sides of the main pole in the track width direction. The first yoke portion is connected to the first shield portion. The second yoke portion is connected to the second shield portion. A coil surrounds at least part of the entire outer periphery of the main pole when viewed from a medium facing surface.
Abstract translation: 磁头包括主极，写屏蔽和返回路径部分。 写屏蔽包括位于主磁极在磁道宽度方向的相对侧上的第一和第二屏蔽部分。 返回路径部分包括在轨道宽度方向上位于主极的相对侧上的第一和第二轭部分。 第一磁轭部分连接到第一屏蔽部分。 第二磁轭部分连接到第二屏蔽部分。 当从面向介质的表面观察时，线圈围绕主极的整个外周的至少一部分。
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