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公开(公告)号：US09230586B1
公开(公告)日：2016-01-05
申请号：US14335984
申请日：2014-07-21
Applicant: TDK Corporation
Inventor： Norikazu Ota , Osamu Nakada , Mitsuo Otsuki , Shinji Hara , Daisuke Miyauchi , Tetsuya Roppongi , Koji Shimazawa
CPC classification number: G11B5/607 , G11B5/6011 , G11B5/6029 , G11B5/6052 , G11B5/6076 , G11B5/6088 , G11B2005/0021
Abstract: While a plurality of drive currents for flying height setting with current values smaller than a tentative optimum drive current are supplied to a light source, respectively, heater power is supplied to a heater part, and touch down of a thermally-assisted magnetic recording head is detected. Tentative optimum heater power is determined based on a correlation between the heater power when the touch down is detected and each drive current for flying height setting. The tentative optimum drive current is supplied to the light source part; the tentative optimum heater power is supplied to the heater part; a reference signal is recorded in a magnetic recording medium; and flying height of the thermally-assisted magnetic recording head is set by determining whether or not the reference signal is recorded with the desired signal intensity.
Abstract translation: 虽然分别将用于飞行高度设定的多个驱动电流设置为具有小于暂定最佳驱动电流的电流值，但是分别将加热器电力提供给加热器部分，并且热辅助磁记录头的向下触摸 检测到。 基于检测到触摸时的加热器功率与用于飞行高度设置的每个驱动电流之间的相关性来确定暂定最佳加热器功率。 暂定最佳驱动电流被提供给光源部分; 将暂定的最佳加热器功率提供给加热器部件; 参考信号被记录在磁记录介质中; 并且通过确定参考信号是否以期望的信号强度被记录来设定热辅助磁记录头的飞行高度。
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2.发明授权Thermal assisted magnetic recording head with protrusion on leading side of plasmon generator 有权热辅助磁记录头，在等离子体发生器的前端具有突起公开(公告)号：US09190084B1
公开(公告)日：2015-11-17
申请号：US14277374
申请日：2014-05-14
Applicant: TDK Corporation , SAE Magnetics (H.K.) Ltd.
Inventor： Kenta Hara , Kosuke Tanaka , Tetsuya Roppongi , Ryuji Fujii , Yasutoshi Fujita
CPC classification number: G11B5/314 , G11B5/1278 , G11B5/3106 , G11B5/3169 , G11B5/4866 , G11B5/6082 , G11B5/6088 , G11B2005/0021 , Y10T29/49034 , Y10T29/4905
Abstract: A thermal assisted magnetic recording head of the present invention has an air bearing surface (ABS) 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 ABS, and a main pole that faces the ABS and emits magnetic flux to the magnetic recording medium. The plasmon generator is opposite to a part of the core and extends to the generator front surface, is coupled with a portion of the propagating light that propagates through the core in the surface plasmon mode to generate a surface plasmon, propagates the surface plasmon to the generator front end surface, and generates near-field light (NF light) at the generator front end surface to irradiate the NF light to the magnetic recording medium. The ABS has a protrusion that is closer to the leading side than the generator front end surface in the down track direction, and that protrudes more toward the magnetic recording medium than the generator front end surface upon operation of the thermal assisted magnetic recording head.
Abstract translation: 本发明的热辅助磁记录头具有与磁记录介质相对的空气轴承表面（ABS），可将激光作为传播光传播的芯，包括面向ABS的发生器前端表面的等离子体发生器， 以及面向ABS并且向磁记录介质发射磁通的主极。 等离子体发生器与芯的一部分相对并延伸到发生器前表面，与表面等离子体模式中传播通过芯的传播光的一部分耦合以产生表面等离子体激元，将表面等离子体传播到 在发生器前端面产生近场光（NF光），将NF光照射到磁记录介质上。 ABS具有比沿着导轨方向更靠近发电机前端表面的前侧的突起，并且在热辅助磁记录头的操作时，比在发生器前端表面更向导磁体的突出。
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公开(公告)号：US08680855B2
公开(公告)日：2014-03-25
申请号：US13726767
申请日：2012-12-26
Applicant: TDK Corporation
Inventor： Isamu Sato , Hiroshi Ikeda , Mikio Matsuzaki , Tetsuya Roppongi , Noboru Yamanaka , Tsutomu Aoyama
IPC: G01R33/02
CPC classification number: G11B5/455 , G01R33/098 , G01R33/1284
Abstract: A measuring circuit system in a magnetic field measuring apparatus of the invention has an amplifier and a band-pass filter connected in sequence on an output terminal side of the TMR element, the band-pass filter is a narrow-range band-pass filter such that a peak pass frequency of the filter that is a center is a basic frequency selected from a range of 10 to 40 GHz and a band width centered around the basic frequency is a narrow range of ±0.5 to ±4 GHz; and with the measuring circuit system, an S/N ratio (SNR) of 3 dB or greater is obtained, the SNR being defined by a ratio of an amplitude S of a high-frequency generated signal induced by the TMR element to a total noise N that is a sum of a head noise generated by the TMR element and a circuit noise generated by the amplifier. With such a configuration, an in-plane high-frequency magnetic field generated by a microwave-assisted magnetic head is reliably and precisely measured.
Abstract translation: 本发明的磁场测量装置中的测量电路系统具有在TMR元件的输出端侧依次连接的放大器和带通滤波器，带通滤波器是窄范围带通滤波器， 作为中心的滤波器的峰值通过频率是从10〜40GHz的范围选择的基本频率，以基本频率为中心的带宽为±0.5〜±4GHz的窄范围; 并且利用测量电路系统，获得3dB或更大的S / N比（SNR），SNR由TMR元件引起的高频产生信号的振幅S与总噪声的比率定义 N是由TMR元件产生的头噪声和由放大器产生的电路噪声之和。 通过这样的结构，可以可靠且精确地测量由微波辅助磁头产生的面内高频磁场。
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公开(公告)号：US10559412B2
公开(公告)日：2020-02-11
申请号：US16204502
申请日：2018-11-29
Applicant: TDK CORPORATION
Inventor： Akimasa Kaizu , Naomichi Degawa , Tetsuya Roppongi
IPC: H01F10/32 , H01L43/02 , H03H11/04 , H03B15/00 , H03H11/16 , H03F15/00 , H01L27/22 , H03H2/00 , G01R33/09 , H01L43/10
Abstract: At least one magnetoresistance effect element and a magnetic field applying unit to apply a magnetic field to the magnetoresistance effect element, the magnetic field applying unit includes a first ferromagnetic material having a portion protruding to the magnetoresistance effect element side in a stacking direction of the magnetoresistance effect element, a second ferromagnetic material sandwiching the magnetoresistance effect element with the first ferromagnetic material, and a coil wound around the first ferromagnetic material, a first magnetization free layer of the magnetoresistance effect element has a portion free of overlapping with at least one of a second surface of the protruding portion on the magnetoresistance effect element side and a third surface of the second ferromagnetic material on the magnetoresistance effect when viewed in the stacking direction, and a center of gravity of the first magnetization free layer, positioned in a region connecting the second surface and the third surface.
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公开(公告)号：US10121497B1
公开(公告)日：2018-11-06
申请号：US15730845
申请日：2017-10-12
Applicant: TDK Corporation
Inventor： Hirokazu Takahashi , Zhengyao Tang , Tetsuya Roppongi , Shinji Hara
Abstract: A magnetic recording head has a main magnetic pole that generates a recording magnetic field applied on a magnetic recording medium from an end surface that is one portion of an air bearing surface facing the magnetic recording medium; a trailing shield provided on the trailing side of the main magnetic pole with a write gap interposed therebetween; and a spin torque oscillator that is provided in the write gap to be interposed between the main magnetic pole and the trailing shield and that generates a magnetic field that exerts an interaction on the recording magnetic field applied on the magnetic recording medium.
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Patent Agency Ranking
公开(公告)号：US10032470B1
公开(公告)日：2018-07-24
申请号：US15649958
申请日：2017-07-14
Applicant: TDK Corporation
Inventor： Naomichi Degawa , Tetsuhito Shinohara , Shinji Hara , Tetsuya Roppongi
Abstract: A magnetic recording head comprises: a main magnetic pole for generating a recording magnetic field applied to a magnetic recording medium from an end surface that is one part of an air bearing surface facing the magnetic recording medium; a trailing shield that is placed by interposing a write gap at a trailing side of the main magnetic pole; and a spin torque oscillator provided in the write gap; wherein, when viewed from the air bearing surface side, the length in the down-track direction between the trailing shield and the cross-track direction end portion of a first end face positioned at the main magnetic pole side of the spin torque oscillator is longer than the length in the down-track direction between the trailing shield and the main magnetic pole at a center position in the cross-track direction of the spin torque oscillator.
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公开(公告)号：US10109302B1
公开(公告)日：2018-10-23
申请号：US15652684
申请日：2017-07-18
Applicant: TDK Corporation
Inventor： Tetsuhito Shinohara , Tetsuya Roppongi , Naomichi Degawa
Abstract: A magnetic recording head is provided with a main magnetic pole that generates a recording magnetic field to be applied to a magnetic recording medium from an end surface which makes a portion of an air bearing surface, a trailing shield that is placed by interposing a write gap at a trailing side of the main magnetic pole, a spin torque oscillator that is placed within the write gap to be between the main magnetic pole and the trailing shield, and two side shields that are placed at both sides of the main magnetic pole in the cross track direction, and when viewed from the air bearing surface side, at least a portion of the trailing-side end surfaces of the side shields are offset toward a leading-side of the main magnetic pole from the leading-side end surface of the spin torque oscillator.
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公开(公告)号：US09824701B2
公开(公告)日：2017-11-21
申请号：US15138486
申请日：2016-04-26
Applicant: TDK Corporation
Inventor： Zhenyao Tang , Tetsuya Roppongi , Yoshikazu Soeno , Hironobu Matsuzawa , Hirokazu Takahashi
CPC classification number: G11B5/1278 , G11B5/235 , G11B5/3116 , G11B5/314 , G11B5/3146 , G11B2005/0024
Abstract: A microwave assisted magnetic head includes a main magnetic pole; a trailing shield; and a spin torque oscillator provided between the main magnetic pole and the trailing shield. The spin torque oscillator has a first end surface configuring a part of an air bearing surface, a second end surface facing the main magnetic pole, and a third end surface facing the first end surface, the first angle θ1 made by the first end surface and the second end surface is smaller than the second angle θ2 formed by the second end surface and the third end surface, and the second angle θ2 is 80 to 100 degrees.
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公开(公告)号：US08817581B1
公开(公告)日：2014-08-26
申请号：US13774521
申请日：2013-02-22
Applicant: TDK Corporation
Inventor： Takeshi Tsutsumi , Ryo Hosoi , Tetsuya Roppongi , Kosuke Tanaka
CPC classification number: G11B5/314 , G11B5/3163 , G11B5/6088 , G11B2005/0021 , Y10T29/49032
Abstract: A plasmon generator of a thermally-assisted magnetic recording head has a first configuration member having a near-field light generation end surface at an ABS, and a second configuration member being in contact with main magnetic pole, and terminating at a front end portion of a slope positioned at the position recessed from the ABS. An end part of a separator layer, which is interposed between the main magnetic pole and the first configuration member, on a side opposite to the ABS is at a position more recessed from the air bearing surface than the front end portion of the slope of the second configuration member.
Abstract translation: 热辅助磁记录头的等离子体发生器具有在ABS处具有近场光产生端面的第一配置构件和与主磁极接触的第二配置构件，并且终止于 位于从ABS凹陷的位置的斜面。 介于主磁极和第一构造构件之间的分隔层的与ABS相反的一侧的端部处于比空气轴承表面更凹下的位置，该位置比斜边的前端部 第二配置成员。
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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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