公开(公告)号：US08860407B2

公开(公告)日：2014-10-14

申请号：US13436732

申请日：2012-03-30

Applicant: Changhe Shang ,  Daniele Mauri ,  Kuok San Ho

Inventor： Changhe Shang ,  Daniele Mauri ,  Kuok San Ho

IPC: G01R33/12 ,  G11B5/455 ,  G11B5/31 ,  G01R31/28

CPC classification number: G01R31/2875 ,  G11B5/3166 ,  G11B5/455

Abstract: A method and system for testing a read transducer are described. The read transducer includes a read sensor fabricated on a wafer. A system includes a test structure that resides on the wafer. The test structure includes a test device and a heater. The test device corresponds to the read sensor. The heater is in proximity to the test device and is configured to heat the test device substantially without heating the read sensor. Thus, the test structure allows for on-wafer testing of the test device at a plurality of temperatures above an ambient temperature.

Abstract translation: 描述了用于测试读取换能器的方法和系统。 读取换能器包括制造在晶片上的读取传感器。 系统包括驻留在晶片上的测试结构。 测试结构包括测试设备和加热器。 测试装置对应于读取传感器。 加热器靠近测试装置，并且被配置为基本上加热测试装置而不加热读取传感器。 因此，测试结构允许在高于环境温度的多个温度下对测试装置进行片上测试。

公开(公告)号：US08203800B2

公开(公告)日：2012-06-19

申请号：US12398837

申请日：2009-03-05

Applicant: Shaoping Li ,  Jinshan Li ,  Feng Liu ,  Kuok San Ho

Inventor： Shaoping Li ,  Jinshan Li ,  Feng Liu ,  Kuok San Ho

IPC: G11B5/09 ,  G11B5/596

CPC classification number: G11B20/1201 ,  G11B20/1217 ,  G11B2020/1281 ,  G11B2220/2516 ,  G11B2220/90

Abstract: A data storage medium comprises a plurality of data regions, and a plurality of servo regions configured to provide positioning information to a reading device. Each of the plurality of data regions corresponds to more than one of the plurality of servo regions. The more than one of the plurality of servo regions are configured to provide positioning information to the reading device at discrete times corresponding to a data operation of a corresponding data region.

Abstract translation: 数据存储介质包括多个数据区，以及被配置为向读取装置提供定位信息的多个伺服区。 多个数据区域中的每一个对应于多个伺服区域中的一个以上。 多个伺服区域中的多于一个被配置为在对应于相应数据区域的数据操作的离散时间向读取装置提供定位信息。

公开(公告)号：US07652855B2

公开(公告)日：2010-01-26

申请号：US11595186

申请日：2006-11-09

Applicant: James Mac Freitag ,  David Eugene Heim ,  Kuok San Ho ,  Wipul Pemsiri Jayasekara ,  Kim Y. Lee ,  Tsann Lin ,  Jyh-Shuey Lo ,  Mustafa Michael Pinarbasi ,  Ching Hwa Tsang

Inventor： James Mac Freitag ,  David Eugene Heim ,  Kuok San Ho ,  Wipul Pemsiri Jayasekara ,  Kim Y. Lee ,  Tsann Lin ,  Jyh-Shuey Lo ,  Mustafa Michael Pinarbasi ,  Ching Hwa Tsang

IPC: G11B5/39

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

Abstract: A lead overlay design of a magnetic sensor is described with sensor and free layer dimensions such that the free layer is stabilized by the large demagnetization field due to the shape anisotropy. In one embodiment the giant magnetoresistive (GMR) effect under the leads is destroyed by removing the antiferromagnetic (AFM) and pinned layers above the free layer. The overlaid lead pads are deposited on the exposed spacer layer at the sides of the mask that defines the active region. In other embodiment a layer of electrically insulating material is deposited over the sensor to encapsulate it and thereby insulate it from contact with the hardbias structures. Various embodiments with self-aligned leads are also described. In a variation of the encapsulation embodiment, the insulating material is also deposited under the lead pads so the electrical current is channeled through the active region of the sensor and sidewall deposited lead pads.

Abstract translation: 用传感器和自由层尺寸描述磁传感器的引线覆盖设计，使得由于形状各向异性，自由层由大的退磁场稳定。 在一个实施例中，引线下的巨磁阻（GMR）效应通过去除自由层上方的反铁磁（AFM）和固定层而被破坏。 覆盖的引线焊盘沉积在限定有源区的掩模侧面上的暴露间隔层上。 在另一个实施例中，电绝缘材料层沉积在传感器上以将其封装并由此使其与硬质合金结构的接触绝缘。 还描述了具有自对准引线的各种实施例。 在封装实施例的变型中，绝缘材料也沉积在引线焊盘下方，使得电流通过传感器的有源区域和侧壁沉积的引线焊盘。

公开(公告)号：US07612970B2

公开(公告)日：2009-11-03

申请号：US11065244

申请日：2005-02-23

Applicant: Hardayal Singh Gill ,  Kuok San Ho

Inventor： Hardayal Singh Gill ,  Kuok San Ho

IPC: G11B5/39

CPC classification number: G11B5/39

Abstract: A magnetoresistive sensor having a free layer biased by an in stack bias layer that comprises a layer of antiferromagnetic material. The bias layer can be IrMnCr, IrMn or some other antiferromagnetic material. The free layer is a synthetic free layer having first and second magnetic layers antiparallel coupled across an AP coupling layer. The first magnetic layer is disposed adjacent to a spacer or barrier layer and the second magnetic layer is exchange coupled with the IrMnCr bias layer. The bias layer biases the magnetic moments of the free layer in desired directions parallel with the ABS without pinning the magnetic moments of the free layer.

Abstract translation: 磁阻传感器，其具有由堆叠偏置层偏置的自由层，该层叠偏压层包括一层反铁磁材料。 偏置层可以是IrMnCr，IrMn或其他一些反铁磁材料。 自由层是具有跨AP耦合层反平行耦合的第一和第二磁性层的合成自由层。 第一磁性层邻近间隔物或阻挡层设置，第二磁性层与IrMnCr偏置层交换耦合。 偏置层在平行于ABS的期望方向上偏置自由层的磁矩，而不会固定自由层的磁矩。

公开(公告)号：US07497008B2

公开(公告)日：2009-03-03

申请号：US11211877

申请日：2005-08-24

Applicant: Tsung Yuan Chen ,  Frederick Hayes Dill ,  James Mac Freitag ,  Kuok San Ho ,  Wipul Pemsiri Jayasekara ,  Kim Y. Lee ,  Mustafa Michael Pinarbasi ,  Ching Hwa Tsang ,  Patrick Rush Webb

Inventor： Tsung Yuan Chen ,  Frederick Hayes Dill ,  James Mac Freitag ,  Kuok San Ho ,  Wipul Pemsiri Jayasekara ,  Kim Y. Lee ,  Mustafa Michael Pinarbasi ,  Ching Hwa Tsang ,  Patrick Rush Webb

IPC: G11B5/127 ,  H04R31/00

CPC classification number: G11B5/3932 ,  G11B5/3929 ,  G11B5/398 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

Abstract: An embodiment of the invention is a magnetic head with overlaid lead pads that contact the top surface of the sensor between the hardbias structures and do not contact the hardbias structures which are electrically insulated from direct contact with the sensor. The lead pad contact area on the top of the sensor is defined by sidewall deposition of a conductive material to form leads pads on a photoresist prior to formation of the remainder of the leads. The conductive material for the lead pads is deposited at a shallow angle to maximize the sidewall deposition on the photoresist, then ion-milled at a high angle to remove the conductive material from the field while leaving the sidewall material. An insulation layer is deposited on the lead material at a high angle, then milled at a shallow angle to remove insulation from the sidewall.

Abstract translation: 本发明的一个实施例是具有覆盖的引线焊盘的磁头，该焊盘在硬质合金结构之间接触传感器的顶表面，并且不接触与传感器直接接触的电绝缘的硬质合金结构。 传感器顶部的引线焊盘接触区域由导电材料的侧壁沉积限定，以在形成其余引线之前在光致抗蚀剂上形成引线焊盘。 用于引线焊盘的导电材料以浅角度沉积，以使光致抗蚀剂上的侧壁沉积最大化，然后以高角度离子研磨，以从外界移除导电材料同时留下侧壁材料。 绝缘层以高角度沉积在引线材料上，然后以浅角度铣削以除去与侧壁的绝缘。

公开(公告)号：US07333304B2

公开(公告)日：2008-02-19

申请号：US10981903

申请日：2004-11-04

Applicant: Hardayal Singh Gill ,  Kuok San Ho

Inventor： Hardayal Singh Gill ,  Kuok San Ho

IPC: G11B5/39

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

Abstract: A current perpendicular to plane (CPP) having hard magnetic bias layers located at the back of the sensor, opposite the air bearing surface. The bias layer is magnetostatically coupled with the free layer to bias the free layer in a desired direction parallel with the ABS. First and second magnetic shield layers may be provided at either lateral side of the sensor to provide exceptional track width definition. The placement of the bias layer at the back of the sensor makes possible the addition of magnetic shields at the sides of the sensor.

Abstract translation: 垂直于平面（CPP）的电流，其具有位于传感器背面的与空气轴承表面相对的硬磁偏置层。 偏置层与自由层静磁耦合，以在平行于ABS的期望方向上偏置自由层。 第一和第二磁屏蔽层可以设置在传感器的两侧，以提供卓越的轨道宽度定义。 偏置层位于传感器背面的位置可以在传感器的侧面添加磁屏蔽。

公开(公告)号：US07199986B2

公开(公告)日：2007-04-03

申请号：US10782301

申请日：2004-02-18

Applicant: Marie-Claire Cyrille ,  Meng Ding ,  Kuok-San Ho ,  Prakash Kasiraj ,  Ernesto Marinero ,  James Lamar Nix ,  Brian York

Inventor： Marie-Claire Cyrille ,  Meng Ding ,  Kuok-San Ho ,  Prakash Kasiraj ,  Ernesto Marinero ,  James Lamar Nix ,  Brian York

IPC: G11B5/33

CPC classification number: G11B5/3932

Abstract: A magnetic sensor is provided, having two bias layers separated by a decoupling layer to eliminate exchange coupling between the bias layers. The two bias layers may have differing coercivities, such that the biases provided by the bias layers to the free layer are independently adjustable. The grain structures of the two bias layers may be substantially decorrelated by the decoupling layer.

Abstract translation: 提供了一种磁传感器，其具有由解耦层隔开的两个偏置层，以消除偏置层之间的交换耦合。 两个偏置层可以具有不同的矫顽力，使得由偏置层提供给自由层的偏压是独立可调的。 两个偏置层的晶粒结构可以通过去耦层基本上去相关。

公开(公告)号：US07043823B2

公开(公告)日：2006-05-16

申请号：US10869590

申请日：2004-06-15

Applicant: Jeffrey R. Childress ,  Elizabeth A. Dobisz ,  Robert E. Fontana, Jr. ,  Kuok San Ho ,  Ching Hwa Tsang ,  Son Van Nguyen

Inventor： Jeffrey R. Childress ,  Elizabeth A. Dobisz ,  Robert E. Fontana, Jr. ,  Kuok San Ho ,  Ching Hwa Tsang ,  Son Van Nguyen

IPC: G11B5/127 ,  B44C1/22

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3163 ,  G11B5/3903 ,  G11B5/3909 ,  G11B2005/3996 ,  H01L43/08 ,  H01L43/12 ,  Y10T29/49032 ,  Y10T29/49041 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

Abstract: A current-perpendicular-to the-plane (CPP) magnetoresistive device, such as a magnetic tunnel junction (MTJ), is formed by patterning a capping layer (e.g., using resist) in the shape of a central region of an underlying free ferromagnetic layer that in turn resides over additional layers of the MTJ. Side regions of the capping layer are removed by ion milling or etching down into the free ferromagnetic layer. Unmasked side regions of the ferromagnetic layer are then oxidized to render them locally non-ferromagnetic and electrically insulating.

Abstract translation: 电流垂直于平面（CPP）的磁阻器件，例如磁性隧道结（MTJ），是通过将覆盖层（例如，使用抗蚀剂）图案化成下层自由铁磁性的中心区域 层又依赖于MTJ的附加层。 通过离子铣削或蚀刻到自由铁磁层中去除覆盖层的侧面区域。 然后将铁磁性层的未掩模的侧面区域氧化，使其局部非铁磁性并电绝缘。

公开(公告)号：US06657825B2

公开(公告)日：2003-12-02

申请号：US09922446

申请日：2001-08-02

Applicant: Kuok San Ho ,  Tao Pan

Inventor： Kuok San Ho ,  Tao Pan

IPC: G11B539

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3916 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

Abstract: A magnetoresistive sensor for use in a data storage device has a recessed sensing element (magnetic tunnel junction, CPP spin valve, etc.) with an exchange biased sensing ferromagnetic (free) layer, and a flux guide that magnetically connects the sensing element to a sensing surface of the sensor. The free layer is selectively exchange biased by a layer of exchange bias material placed under non-active regions of the free layer that lie outside the sensing element and flux guide track widths. The flux guide is provided by extending the free layer from a forward edge of the sensing element to the sensor surface. Advantageously, the sensing element and the flux guide have equal track width so that magnetic flux directed from the flux guide into the sensing element is not diluted with consequent loss of sensitivity.

Abstract translation: 用于数据存储装置的磁阻传感器具有具有交换偏置感测铁磁（自由）层的凹陷感测元件（磁性隧道结，CPP自旋阀等），以及将感测元件磁连接到 感测传感器的表面。 自由层通过位于感应元件外部的自由层的非有源区域和通量导轨宽度上的交换偏置材料层选择性交换。 通过将自由层从感测元件的前边缘延伸到传感器表面来提供磁通引导件。 有利地，感测元件和磁通引导件具有相等的轨道宽度，使得从通量引导件引导到感测元件中的磁通量不会被稀释，从而导致灵敏度的损失。

公开(公告)号：US08675318B1

公开(公告)日：2014-03-18

申请号：US13302994

申请日：2011-11-22

Applicant: Kuok San Ho ,  Savas Gider ,  Daniele Mauri ,  Ming Mao ,  Sining Mao

Inventor： Kuok San Ho ,  Savas Gider ,  Daniele Mauri ,  Ming Mao ,  Sining Mao

IPC: G11B5/39

CPC classification number: G11B5/398 ,  G11B5/3912

Abstract: A method and system for providing a read magnetic transducer having an air-bearing surface (ABS) is described. The magnetic read transducer includes a first shield, a read sensor stack, an antiferromagnetic (AFM) tab, and a second shield. The read sensor stack includes a pinned layer, a spacer layer, and a free layer. The spacer layer is nonmagnetic and between the pinned layer and the free layer. A portion of the read sensor stack is at the ABS. The AFM tab is recessed from the ABS and adjacent to a portion of the pinned layer. The read sensor resides between the first shield and the second shield.

Abstract translation: 描述了一种用于提供具有空气轴承表面（ABS）的读取磁换能器的方法和系统。 磁读取传感器包括第一屏蔽，读取传感器堆叠，反铁磁（AFM）接头和第二屏蔽。 读取传感器堆叠包括钉扎层，间隔层和自由层。 间隔层是非磁性的，在被钉扎层和自由层之间。 读取传感器堆叠的一部分在ABS。 AFM标签从ABS凹入并与被钉扎层的一部分相邻。 读取传感器位于第一屏蔽和第二屏蔽之间。