公开(公告)号：US08431255B2

公开(公告)日：2013-04-30

申请号：US12317534

申请日：2008-12-24

Applicant: Das Sarbanoo ,  Hiroyuki Suzuki ,  Takayoshi Ohtsu

Inventor： Das Sarbanoo ,  Hiroyuki Suzuki ,  Takayoshi Ohtsu

IPC: G11B5/39 ,  H01L43/06 ,  H01F10/06

CPC classification number: G11B5/374 ,  G01R33/07 ,  G11C11/18 ,  H01F10/137 ,  H01L43/06 ,  Y10T428/1121 ,  Y10T428/1129 ,  Y10T428/1143 ,  Y10T428/1171

Abstract: Embodiments of the present invention relate to a galvanomagnetic device for use as a magnetic sensor or magnetic memory device. In a particular embodiment, the galvanomagnetic device comprises a non-conductive substrate, a first magnetic layer having a magnetic anisotropy perpendicular to the surface thereof, and a ferromagnetic second magnetic layer formed on the first magnetic layer. On the second magnetic layer, current electrodes are disposed to pass a current between two points, and voltage electrodes are disposed to detect a Hall voltage between two points perpendicularly to the current flow direction.

公开(公告)号：US08335057B2

公开(公告)日：2012-12-18

申请号：US12536255

申请日：2009-08-05

Applicant: Masahiro Osugi ,  Takayoshi Ohtsu ,  Shigeo Fujita ,  Katsuro Watanabe ,  Koji Kataoka

Inventor： Masahiro Osugi ,  Takayoshi Ohtsu ,  Shigeo Fujita ,  Katsuro Watanabe ,  Koji Kataoka

IPC: G11B5/33

CPC classification number: G11B5/3909 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/3912 ,  G11B2005/3996

Abstract: According to one embodiment, a CPP magnetoresistive head includes a magnetoresistive film comprising a free layer above a non-magnetic intermediate layer and a fixed layer below the non-magnetic intermediate layer, wherein the magnetoresistive film is between a lower magnetic shield layer and an upper magnetic shield layer. The CPP magnetoresistive head also includes a domain control film on each side of the magnetoresistive film, wherein a sense current flows through the magnetoresistive film between the upper magnetic shield layer and the lower magnetic shield layer. The CPP magnetoresistive head also includes a high heat conductivity layer, and a heat dissipation layer having a high heat conductivity and a low linear expansion coefficient, the heat dissipation layer being disposed at the back in a device height direction of the magnetoresistive film and on each side of the domain control film.

Abstract translation: 根据一个实施例，CPP磁阻磁头包括磁阻膜，该磁阻膜包括在非磁性中间层上方的自由层和位于非磁性中间层之下的固定层，其中磁阻膜位于下部磁屏蔽层和上部磁屏蔽层之间 磁屏蔽层。 CPP磁阻头还包括在磁阻膜的每一侧的畴控制膜，其中感测电流流过上磁屏蔽层和下磁屏蔽层之间的磁阻膜。 CPP磁阻头还包括高导热层和具有高导热性和低线性膨胀系数的散热层，散热层设置在磁阻膜的器件高度方向的背面，并且在每个 侧面的域控制膜。

公开(公告)号：US08221192B2

公开(公告)日：2012-07-17

申请号：US12537982

申请日：2009-08-07

Applicant: Hidekazu Kashiwase ,  Hiroyuki Suzuki ,  Masae Suzuki, legal representative ,  Mitsuhiro Shoda ,  Takayoshi Ohtsu ,  Kiyoshi Hashimoto

Inventor： Hidekazu Kashiwase ,  Hiroyuki Suzuki ,  Mitsuhiro Shoda ,  Takayoshi Ohtsu ,  Kiyoshi Hashimoto

IPC: B24B49/00

CPC classification number: G11B5/8404 ,  G11B5/3136 ,  G11B5/455 ,  G11B5/6064

Abstract: A magnetic-recording-disk test-head. The magnetic-recording-disk test-head includes a slider, a test pad and a slider-surface-shape control mechanism. The slider includes a leading edge and a trailing edge. The test pad is disposed at a trailing-edge side of the slider and is configured to remove and to detect asperities on a magnetic-recording disk. The slider-surface-shape control mechanism is configured to change a shape of an air-bearing surface of the slider and is disposed at a leading-edge side of the slider.

Abstract translation: 磁记录盘测试头。 磁记录盘测试头包括滑块，测试垫和滑块表面形状控制机构。 滑块包括前缘和后缘。 测试垫设置在滑块的后缘侧，并且被配置为移除并检测磁记录盘上的凹凸。 滑块表面形状控制机构构造为改变滑块的空气轴承表面的形状并且设置在滑块的前缘侧。

公开(公告)号：US20120120528A1

公开(公告)日：2012-05-17

申请号：US12947796

申请日：2010-11-16

Applicant: Masaru Furukawa ,  Yuki Shimizu ,  Junguo Xu ,  Yohji Maruyama ,  Takayoshi Ohtsu ,  Toshiya Shiramatsu

Inventor： Masaru Furukawa ,  Yuki Shimizu ,  Junguo Xu ,  Yohji Maruyama ,  Takayoshi Ohtsu ,  Toshiya Shiramatsu

IPC: G11B5/48

CPC classification number: G11B5/255 ,  G11B5/3106 ,  G11B5/314 ,  G11B5/40 ,  G11B5/6076

Abstract: A slider comprising a contact sensor element configured to respond to a change in resistance due to a change in temperature, and a shield structure. The shield structure comprises a lower thermal conductivity than the contact sensor element and a greater hardness than the contact sensor element.

Abstract translation: 一种滑动件，包括接触传感器元件，其被配置为响应由于温度变化引起的电阻变化，以及屏蔽结构。 屏蔽结构包括比接触传感器元件更低的热导率并且具有比接触传感器元件更大的硬度。

公开(公告)号：US20080019034A1

公开(公告)日：2008-01-24

申请号：US11880400

申请日：2007-07-20

Applicant: Takayoshi Ohtsu

Inventor： Takayoshi Ohtsu

IPC: G11B21/02

CPC classification number: G11B5/455

Abstract: Embodiments in accordance with the present invention provide a low-priced magnetic head evaluation apparatus capable of evaluating characteristics at high speed. According to one embodiment, a magnetic head evaluation apparatus includes a spindle motor, a VCM actuator as a head moving mechanism, and a ramp mechanism. A spindle motor used in a product HDD is used for the spindle motor. A VCM actuator used in the product HDD is used for the VCM actuator. A ramp mechanism used in the product HDD is used for the ramp mechanism. The apparatus further includes a non-contact type position detector such as a laser length measuring instrument. The non-contact type position detector irradiates a side surface of a load beam with a laser beam. An absolute position of the load beam over a magnetic disk is detected by detecting light reflected off the side surface of the load beam. Mounting of an HGA relative to the load beam is achieved by using a caulking hole in a mount plate.

Abstract translation: 根据本发明的实施例提供一种能够高速评价特性的低价磁头评价装置。 根据一个实施例，磁头评估装置包括主轴电动机，作为磁头移动机构的VCM致动器和斜坡机构。 主轴电机使用产品HDD中使用的主轴电机。 产品HDD中使用的VCM执行器用于VCM执行器。 用于产品HDD的斜坡机构用于斜坡机构。 该装置还包括诸如激光长度测量仪器的非接触型位置检测器。 非接触型位置检测器用激光束照射负载光束的侧面。 通过检测从负载梁的侧表面反射的光来检测负载光束在磁盘上的绝对位置。 通过在安装板上使用铆接孔来实现HGA相对于负载梁的安装。

公开(公告)号：US20070258171A1

公开(公告)日：2007-11-08

申请号：US11787098

申请日：2007-04-12

Applicant: Takayoshi Ohtsu

Inventor： Takayoshi Ohtsu

IPC: G11B5/33

CPC classification number: G11B5/314 ,  G11B5/102 ,  G11B5/486 ,  G11B5/6005 ,  G11B5/6064

Abstract: When exogenous noise is applied to the ground wire of a thin film magnetic head, crosstalk noise occurs in a lead line and a ground lines located near the ground wire. Embodiments in accordance with the present invention avoid this by providing a common terminal near the central portion of a thin film head portion. Write element terminals are connected to lines extending from a coil. Read element terminals are connected to lead wires extending from electrodes of a GMR element. A heater terminal is connected to a line extending from a heater. The common terminal is connected to a ground line of upper and lower shields via a resistor, to ground lines of electrodes via other resistors and to a ground line of upper and lower magnetic pole pieces of a write element via another resistor. A ground line of a slider, a ground line of the heater, and a ground line of the common terminal are all connected to a ground terminal.

Abstract translation: 当外部噪声施加到薄膜磁头的接地线时，在引线和位于接地线附近的接地线上会发生串扰噪声。 根据本发明的实施例通过在薄膜头部的中心部分附近设置公共端子来避免这种情况。 写元件端子连接到从线圈延伸的线。 读元件端子连接到从GMR元件的电极延伸的引线。 加热器端子连接到从加热器延伸的线。 公共端子经由电阻器连接到上下屏蔽的接地线，经由其它电阻器连接到电极的接地线，并且经由另一个电阻器连接到写入元件的上部和下部磁极片的接地线。 滑块的接地线，加热器的接地线和公共端子的接地线都连接到接地端子。

公开(公告)号：US07031123B2

公开(公告)日：2006-04-18

申请号：US10660865

申请日：2003-09-11

Applicant: Takayoshi Ohtsu ,  Satoshi Shigematsu ,  Kouji Nishioka ,  Takao Imagawa ,  Kouji Kataoka ,  Masatoshi Arasawa ,  Norifumi Miyamoto

Inventor： Takayoshi Ohtsu ,  Satoshi Shigematsu ,  Kouji Nishioka ,  Takao Imagawa ,  Kouji Kataoka ,  Masatoshi Arasawa ,  Norifumi Miyamoto

IPC: G11B5/39

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3116 ,  G11B5/3909 ,  G11B5/3932 ,  G11B5/3967 ,  G11B2005/3996

Abstract: A magnetoresistive head comprises a free magnetic layer that has first and second free magnetic films sandwiching a non-magnetic intermediate film therebetween, the respective magnetizing directions of the first and the second free magnetic films are antiparallel. The length of the free magnetic layer in the direction of the track width is 200 nm or less, and a difference between a product of saturation magnetic flux density and a film thickness of the first free magnetic film, and that of the second free magnetic film is within a range from 1 to 3 nmT. By this structure, the variation of output and the variation of asymmetry is greatly decreased at a track width of 200 nm or less.

Abstract translation: 磁阻头包括具有夹在其间的非磁性中间膜的第一和第二自由磁性膜的自由磁性层，第一和第二自由磁性膜的各自的磁化方向是反平行的。 自由磁性层在磁道宽度方向上的长度为200nm以下，饱和磁通密度与第一自由磁性膜的膜厚的乘积与第二自由磁性膜的膜厚之差 在1〜3nmT的范围内。 通过这种结构，在200nm或更小的轨道宽度处，输出的变化和不对称性的变化大大降低。

公开(公告)号：US06697235B2

公开(公告)日：2004-02-24

申请号：US10041611

申请日：2002-01-10

Applicant: Takayoshi Ohtsu ,  Koichi Nishioka

Inventor： Takayoshi Ohtsu ,  Koichi Nishioka

IPC: G11B539

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/3932 ,  G11B2005/3996 ,  Y10T428/1107

Abstract: A magnetoresistive head includes a substrate, first and second magnetic shields, a magnetoresistive effect film formed within a gap layer between the first and second magnetic shields, a permanent magnet layer provided on both sides of the magnetoresistive effect film in order to apply a magnetic field to the film, and an electrode film provided on the permanent magnet layer so as to permit a signal detected current to flow, wherein a magnetic film is stacked on the permanent magnet layer with a nonmagnetic separation layer interposed between the permanent magnet layer and the magnetic film so that the magnetic film has formed therein a magnetic path, thus, it is possible to provide a GMR reproduce head of which the reproduction sensitivity can be maintained high even if the track width is narrow.

Abstract translation: 磁阻头包括衬底，第一和第二磁屏蔽，形成在第一和第二磁屏蔽之间的间隙层内的磁阻效应膜，设置在磁阻效应膜两侧的永磁体层，以施加磁场 以及设置在永久磁铁层上以使信号检测电流流动的电极膜，其中磁性膜层叠在永磁体层上，其中非磁性分离层置于永磁体层和磁性层之间 使得磁性膜在其中形成有磁路，因此，即使轨道宽度窄，也可以提供其再现灵敏度可以保持较高的GMR再现头。

公开(公告)号：US08477455B2

公开(公告)日：2013-07-02

申请号：US12947796

申请日：2010-11-16

Applicant: Masaru Furukawa ,  Yuki Shimizu ,  Junguo Xu ,  Yohji Maruyama ,  Takayoshi Ohtsu ,  Toshiya Shiramatsu

Inventor： Masaru Furukawa ,  Yuki Shimizu ,  Junguo Xu ,  Yohji Maruyama ,  Takayoshi Ohtsu ,  Toshiya Shiramatsu

IPC: G11B5/02

CPC classification number: G11B5/255 ,  G11B5/3106 ,  G11B5/314 ,  G11B5/40 ,  G11B5/6076

Abstract: A slider comprising a contact sensor element configured to respond to a change in resistance due to a change in temperature, and a shield structure. The shield structure comprises a lower thermal conductivity than the contact sensor element and a greater hardness than the contact sensor element.

Abstract translation: 一种滑动件，包括接触传感器元件，其被配置为响应由于温度变化引起的电阻变化，以及屏蔽结构。 屏蔽结构包括比接触传感器元件更低的热导率并且具有比接触传感器元件更大的硬度。

公开(公告)号：US08184406B2

公开(公告)日：2012-05-22

申请号：US11786458

申请日：2007-04-10

Applicant: Nubuo Yoshida ,  Katsuro Watanabe ,  Takayoshi Ohtsu

Inventor： Nubuo Yoshida ,  Katsuro Watanabe ,  Takayoshi Ohtsu

IPC: G11B5/147 ,  G11B5/127

CPC classification number: G11B5/3909 ,  B82Y10/00 ,  B82Y25/00 ,  G01R33/093 ,  G11B5/3163 ,  G11B5/3929 ,  G11B2005/3996 ,  H01F41/34 ,  Y10T29/49021

Abstract: Embodiments in accordance with the present invention provide a thin film magnetic head for preventing a short-circuit failure during formation of a track portion or a stripe-height portion and improving a yield. In one embodiment, a stripe-height direction is first formed, and then a track-width direction is formed. A third insulating film having a smoothly shaped wall surface is formed on a first insulating film during stripe-height formation. During formation of the third insulating film, an optimized lift-off pattern is used to smooth an edge shape.

Abstract translation: 根据本发明的实施例提供了一种薄膜磁头，用于防止在形成轨道部分或条纹高度部分期间发生短路故障并提高产量。 在一个实施例中，首先形成条纹高度方向，然后形成轨道宽度方向。 在条纹高度形成期间，在第一绝缘膜上形成具有平滑形状的壁表面的第三绝缘膜。 在第三绝缘膜的形成期间，使用优化的剥离图案来平滑边缘形状。