公开(公告)号：US08860407B2

公开(公告)日：2014-10-14

申请号：US13436732

申请日：2012-03-30

申请人： Changhe Shang ,  Daniele Mauri ,  Kuok San Ho

发明人： Changhe Shang ,  Daniele Mauri ,  Kuok San Ho

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

CPC分类号： G01R31/2875 ,  G11B5/3166 ,  G11B5/455

摘要： 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.

摘要翻译： 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

申请人： Shaoping Li ,  Jinshan Li ,  Feng Liu ,  Kuok San Ho

发明人： Shaoping Li ,  Jinshan Li ,  Feng Liu ,  Kuok San Ho

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B20/1201 ,  G11B20/1217 ,  G11B2020/1281 ,  G11B2220/2516 ,  G11B2220/90

摘要： 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.

摘要翻译： 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：US07612970B2

公开(公告)日：2009-11-03

申请号：US11065244

申请日：2005-02-23

申请人： Hardayal Singh Gill ,  Kuok San Ho

发明人： Hardayal Singh Gill ,  Kuok San Ho

IPC分类号： G11B5/39

CPC分类号： G11B5/39

摘要： 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.

摘要翻译： 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

申请人： 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

发明人： 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分类号： G11B5/127 ,  H04R31/00

CPC分类号： G11B5/3932 ,  G11B5/3929 ,  G11B5/398 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

摘要： 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.

摘要翻译： 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

申请人： Hardayal Singh Gill ,  Kuok San Ho

发明人： Hardayal Singh Gill ,  Kuok San Ho

IPC分类号： G11B5/39

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3909 ,  G11B5/3932 ,  G11B2005/3996

摘要： 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.

摘要翻译： 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：US07043823B2

公开(公告)日：2006-05-16

申请号：US10869590

申请日：2004-06-15

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

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

IPC分类号： G11B5/127 ,  B44C1/22

CPC分类号： 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

摘要： 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.

摘要翻译： 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

申请人： Kuok San Ho ,  Tao Pan

发明人： Kuok San Ho ,  Tao Pan

IPC分类号： G11B539

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

摘要： 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.

摘要翻译： 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：US08630068B1

公开(公告)日：2014-01-14

申请号：US13296970

申请日：2011-11-15

申请人： Daniele Mauri ,  Chih-Ching Hu ,  Ming Mao ,  Kuok San Ho ,  Savas Gider

发明人： Daniele Mauri ,  Chih-Ching Hu ,  Ming Mao ,  Kuok San Ho ,  Savas Gider

IPC分类号： G11B5/39

CPC分类号： G11B5/3909 ,  B82Y10/00 ,  G11B5/3912 ,  G11B2005/3996

摘要： A method and system for providing a magnetic transducer having an air-bearing surface (ABS) is described. The magnetic read transducer includes a first shield, a magnetoresistive sensor, at least one soft magnetic side shield, and a second shield. The magnetoresistive sensor includes a sensor layer having at least one edge in the track width direction along the ABS. The at least one soft magnetic side shield is adjacent to the at least one edge of the sensor layer. The at least one soft magnetic side shield has a full film permeability of at least ten. The magnetoresistive sensor is between the first shield and the second shield and free of an in-stack hard bias layer.

摘要翻译： 描述了一种用于提供具有空气轴承表面（ABS）的磁换能器的方法和系统。 磁读取传感器包括第一屏蔽，磁阻传感器，至少一个软磁侧屏蔽和第二屏蔽。 磁阻传感器包括具有沿ABS的轨道宽度方向上的至少一个边缘的传感器层。 所述至少一个软磁侧屏蔽件邻近所述传感器层的所述至少一个边缘。 所述至少一个软磁侧屏具有至少十个全透膜度。 磁阻传感器位于第一屏蔽和第二屏蔽之间，并且没有堆叠内的硬偏置层。

公开(公告)号：US20100214699A1

公开(公告)日：2010-08-26

申请号：US12777993

申请日：2010-05-11

申请人： Kuok San Ho ,  Edward Hin Pong Lee ,  David John Seagle ,  Ching Hwa Tsang

发明人： Kuok San Ho ,  Edward Hin Pong Lee ,  David John Seagle ,  Ching Hwa Tsang

IPC分类号： G11B5/33

CPC分类号： G11B5/3929 ,  B82Y25/00 ,  G01R33/093 ,  G11B5/3912 ,  G11B5/398

摘要： A magnetic head according to one embodiment includes a first magnetic shield; a first insulation layer disposed above said first magnetic shield; a plurality of sensor layers disposed above said first insulation layer; two electrical leads overlying a majority of a surface of the sensor layers, the electrical leads being formed of a magnetic material and serving as a second magnetic shield; and a read width insulation member disposed above said sensor layers and between said two electrically conductive members, the read width insulation members lying in a common plane with the electrically conductive members, the common plane being oriented parallel to a plane of deposition of the read width insulation member. Other systems and methods are also presented.

摘要翻译： 根据一个实施例的磁头包括第一磁屏蔽; 设置在所述第一磁屏蔽上方的第一绝缘层; 设置在所述第一绝缘层上方的多个传感器层; 两个电引线覆盖传感器层的大部分表面，电引线由磁性材料形成并用作第二磁屏蔽; 以及读宽度绝缘部件，其设置在所述传感器层之上和所述两个导电部件之间，所述读宽度绝缘部件与所述导电部件位于公共平面中，所述公共平面定向为平行于所述读宽度的沉积平面 绝缘构件。 还提出了其他系统和方法。

公开(公告)号：US07697246B2

公开(公告)日：2010-04-13

申请号：US11502955

申请日：2006-08-10

申请人： James Mac Freitag ,  Kuok San Ho ,  Mustafa Michael Pinarbasi ,  Ching Hwa Tsang

发明人： James Mac Freitag ,  Kuok San Ho ,  Mustafa Michael Pinarbasi ,  Ching Hwa Tsang

IPC分类号： G11B5/39

CPC分类号： H01L43/10 ,  B82Y25/00 ,  G01R33/093 ,  G11B5/3906 ,  G11B5/398

摘要： A current perpendicular to plane (CPP) magnetoresistive sensor having a current path defined by first and second overlying insulation layers between which an electrically conductive lead makes content with a surface of the sensor stack. The current path being narrower than the width of the sensor stack allows the outer edges of the sensor stack to be moved outside of the active area of the sensor. This results in a sensor that is unaffected by damage at outer edges of the sensor layers. The sensor stack includes a free layer that is biased by direct exchange coupling with a layer of antiferromagnetic material (AFM layer). The strength of the exchange field can be controlled by adding Cr to the AFM material to ensure that the exchange field is sufficiently weak to avoid pinning the free layer.

摘要翻译： 一种垂直于平面（CPP）磁阻传感器的电流，其具有由第一和第二上覆绝缘层限定的电流路径，导电引线与传感器堆叠的表面成为内容。 当前路径比传感器堆叠的宽度窄，允许传感器堆叠的外边缘移动到传感器的有效区域之外。 这导致传感器不受传感器层外边缘损坏的影响。 传感器堆叠包括通过与反铁磁材料层（AFM层）的直接交换耦合而偏置的自由层。 可以通过向AFM材料添加Cr来控制交换场的强度，以确保交换场足够弱以避免固定自由层。