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1. 发明授权

US10115419B2 Method for AFC shields for multiple sensor magnetic transducers and magnetic transducers having multiple sensors and AFC shields 有权
公开(公告)号：US10115419B2
公开(公告)日：2018-10-30
申请号：US15672857
申请日：2017-08-09
申请人： WESTERN DIGITAL (FREMONT), LLC
发明人： Rongfu Xiao , Shihai He , Daniele Mauri , Ming Mao , Shaoping Li
IPC分类号： G11B5/39 , G11B5/11 , G11B5/48 , C21D6/00 , C21D9/00 , G11B5/31
摘要： A method and system provide a magnetic transducer having an air-bearing surface (ABS). The method includes providing a first shield, a first read sensor, an antiferromagnetically coupled (AFC) shield that includes an antiferromagnet, a second read sensor and a second shield. The read sensors are between the first and second shields. The AFC shield is between the read sensors. An optional anneal for the first shield is in a magnetic field at a first angle from the ABS. Anneals for the first and second read sensors are in magnetic fields in desired first and second read sensor bias directions. The AFC shield anneal is in a magnetic field at a third angle from the ABS. The second shield anneal is in a magnetic field at a fifth angle from the ABS. The fifth angle is selected based on a thickness and a desired AFC shield bias direction for the antiferromagnet.

2. 发明授权

US09396743B1 Systems and methods for controlling soft bias thickness for tunnel magnetoresistance readers 有权
标题翻译：用于控制隧道磁阻读取器的软偏置厚度的系统和方法
公开(公告)号：US09396743B1
公开(公告)日：2016-07-19
申请号：US14308366
申请日：2014-06-18
申请人： Western Digital (Fremont), LLC
发明人： Yi Zheng , Ming Jiang , Anup G. Roy , Guanxiong Li , Ming Mao , Daniele Mauri
IPC分类号： G11B5/39
CPC分类号： H01L43/12 , G01R33/098 , G11B5/3163 , G11B5/3906 , G11B5/3909 , G11B5/3932 , G11B5/398 , H01L43/02 , H01L43/08 , H01L43/10
摘要： Systems and methods for controlling a thickness of a soft bias layer in a tunnel magnetoresistance (TMR) reader are provided. One such method involves providing a magnetoresistive sensor stack including a free layer and a bottom shield layer, performing contiguous junction milling on the sensor stack, depositing an insulating layer on the sensor stack, depositing a spacer layer on the insulating layer, performing an angled milling sub-process to remove preselected portions of the spacer layer, depositing a soft bias layer on the sensor stack, and depositing a top shield layer on the sensor stack and the soft bias layer. The method can further involve adjusting an alignment of a top surface of the spacer layer with respect to the free layer. In one such case, the top surface of the spacer layer is adjusted to be below the free layer.
摘要翻译：提供了用于控制隧道磁阻（TMR）读取器中的软偏置层的厚度的系统和方法。一种这样的方法包括提供包括自由层和底部屏蔽层的磁阻传感器堆叠，在传感器堆叠上执行连续接合铣削，在传感器堆叠上沉积绝缘层，在绝缘层上沉积间隔层，执行倾斜铣削子过程以去除间隔层的预选部分，在传感器堆叠上沉积柔性偏置层，以及在传感器堆叠和柔性偏置层上沉积顶部屏蔽层。该方法还可以包括相对于自由层调整间隔层的顶表面的对准。在一种这样的情况下，间隔层的顶表面被调节到低于自由层。

3. 发明授权

US09449621B1 Dual free layer magnetic reader having a rear bias structure having a high aspect ratio 有权
标题翻译：具有高纵横比的后偏置结构的双自由层磁读取器
公开(公告)号：US09449621B1
公开(公告)日：2016-09-20
申请号：US14674899
申请日：2015-03-31
申请人： Western Digital (Fremont), LLC
发明人： Daniele Mauri , Savas Gider , Hui Zhao , Ming Mao
IPC分类号： G11B5/39
CPC分类号： G11B5/3906 , G11B5/3932 , G11B5/3951 , G11B5/398
摘要： A magnetic read apparatus has an air-bearing surface (ABS) and includes a read sensor and a rear magnetic bias structure. The read sensor includes first and second free layers, a spacer layer and a rear surface opposite to the ABS. The spacer layer is nonmagnetic and between the first and second free layers. The read sensor has a track width in a cross track direction parallel to the ABS. The rear magnetic bias structure magnetically biases the read sensor a stripe height direction perpendicular to the ABS. The read sensor is between the ABS and the rear magnetic bias structure. The rear magnetic bias structure has a width in the cross track direction and a length in the stripe height direction. The length is greater than the width. The width of the rear magnetic bias structure is substantially equal to the track width of the read sensor.
摘要翻译：磁读取装置具有空气轴承表面（ABS），并且包括读取传感器和后部磁偏置结构。读取传感器包括第一和第二自由层，间隔层和与ABS相对的后表面。间隔层是非磁性的，并且在第一和第二自由层之间。读取传感器在平行于ABS的交叉轨道方向上具有轨道宽度。后磁偏置结构使读取传感器偏置垂直于ABS的条带高度方向。读取传感器位于ABS和后部磁偏置结构之间。后磁偏置结构具有横向方向上的宽度和条高度方向上的长度。长度大于宽度。后磁偏置结构的宽度基本上等于读取传感器的磁道宽度。

4. 发明授权

US09384763B1 Dual free layer magnetic reader having a rear bias structure including a soft bias layer 有权
标题翻译：具有包括柔性偏置层的后偏置结构的双自由层磁读取器
公开(公告)号：US09384763B1
公开(公告)日：2016-07-05
申请号：US14670340
申请日：2015-03-26
申请人： Western Digital (Fremont), LLC
发明人： Feng Liu , Daniele Mauri
IPC分类号： G11B5/39
CPC分类号： G11B5/3932 , G11B5/398
摘要： A method and system provide a magnetic read apparatus having an air-bearing surface (ABS). The read apparatus includes a read sensor, a side bias structure and a rear magnetic bias structure. The read sensor includes first and second free layers, a spacer layer and a rear surface opposite to the ABS. The spacer layer is nonmagnetic and between the first and second free layers. The side bias structure is adjacent to the side surface(s) and magnetically biases the first and second free layers to be antiferromagnetically aligned. The rear magnetic bias structure biases the free layers in a scissor mode. The read sensor is between the ABS and the rear magnetic bias structure. The rear magnetic bias structure includes a rear soft magnetic bias structure having a saturation magnetization-thickness product of at least one milli-emu/cm2 and not more than three milli-emu/cm2.
摘要翻译：一种方法和系统提供具有空气轴承表面（ABS）的磁读取装置。读取装置包括读取传感器，侧偏置结构和后部磁偏置结构。读取传感器包括第一和第二自由层，间隔层和与ABS相对的后表面。间隔层是非磁性的，并且在第一和第二自由层之间。侧偏置结构与侧表面相邻并且磁偏置第一和第二自由层以反铁磁对准。后磁偏置结构以剪刀模式偏置自由层。读取传感器位于ABS和后部磁偏置结构之间。后部磁偏置结构包括具有至少1毫安/厘米2且不大于3毫安/厘米2的饱和磁化强度产品的后软磁偏置结构。

5. 发明授权

US09147404B1 Method and system for providing a read transducer having a dual free layer 有权
标题翻译：用于提供具有双自由层的读取换能器的方法和系统
公开(公告)号：US09147404B1
公开(公告)日：2015-09-29
申请号：US14675326
申请日：2015-03-31
申请人： Western Digital (Fremont), LLC
发明人： Guanghong Luo , Chen-Jung Chien , Ming Mao , Daniele Mauri , Ming Jiang
IPC分类号： G11B5/33 , G11B5/127 , G11B5/60
CPC分类号： G11B5/33 , G01R33/098 , G11B5/3163 , G11B5/3906 , G11B5/3932 , G11B5/398
摘要： A method provides a magnetic transducer having an air-bearing surface (ABS). The method includes providing a read sensor stack for a read sensor of the read device and defining a read sensor from the read sensor stack in a stripe height direction. The stripe height direction is perpendicular to the ABS. At least one magnetic bias structure is also provided. An insulating layer is deposited on the read sensor. The insulating layer has a full film removal rate of not more than fifty Angstroms per minute. The insulating layer also has a top surface. The insulating layer is planarized. At least a portion of the top surface of the insulating layer being exposed at the start of the planarizing step. At least the read sensor is defined in a track width direction.
摘要翻译：一种方法提供具有空气轴承表面（ABS）的磁换能器。该方法包括提供用于读取装置的读取传感器的读取传感器堆叠并且在条带高度方向上从读取传感器堆叠中定义读取传感器。条纹高度方向垂直于ABS。还提供至少一个磁偏置结构。绝缘层沉积在读取的传感器上。绝缘层具有不超过每分钟五十埃的完全膜去除速率。绝缘层也具有顶面。绝缘层被平坦化。在平坦化步骤开始时，绝缘层的顶表面的至少一部分被暴露。至少读取传感器在轨道宽度方向上被定义。

6. 发明授权

US09812155B1 Method and system for fabricating high junction angle read sensors 有权
公开(公告)号：US09812155B1
公开(公告)日：2017-11-07
申请号：US14949155
申请日：2015-11-23
申请人： Western Digital (Fremont), LLC
发明人： Anup Ghosh Roy , Guanxiong Li , Daniele Mauri , Ming Mao , Goncalo Albuquerque , Savas Gider
IPC分类号： G11B5/39 , G11B5/127 , G11B5/33
CPC分类号： G11B5/3932 , G11B5/3163 , G11B5/33 , G11B5/3906 , G11B5/398
摘要： A method provides a magnetic read apparatus. A sensor stack is deposited. The read sensor is defined from the stack such that the sensor has sides forming a junction angle of 75 degrees-105 degrees from a sensor bottom. Defining the sensor includes performing a first ion mill at a first angle and a first energy and performing a second ion mill at a second angle greater than the first angle and at a second energy less than the first energy. The first angle is 5 degrees-30 degrees from normal to the top surface. After the first ion mill, less than half of the stack's bottom layer depth remains unmilled. Magnetic bias structure(s) adjacent to the sides may be formed. The magnetic bias structure(s) include a side shielding material having at least one of the saturation magnetization greater than 800 emu/cm3 and an exchange length less than five nanometers.

7. 发明授权

US09754613B2 Method for AFC shields for multiple sensor magnetic transducers and magnetic transducers having multiple sensors and AFC shields 有权
公开(公告)号：US09754613B2
公开(公告)日：2017-09-05
申请号：US15219474
申请日：2016-07-26
申请人： Western Digital (Fremont), LLC
发明人： Rongfu Xiao , Shihai He , Daniele Mauri , Ming Mao , Shaoping Li
IPC分类号： G11B5/39 , G11B5/11 , G11B5/48 , C21D6/00 , C21D9/00 , G11B5/31
CPC分类号： G11B5/3912 , C21D6/001 , C21D6/007 , C21D9/0068 , G11B5/11 , G11B5/112 , G11B5/3163 , G11B5/3909 , G11B5/3932 , G11B5/3948 , G11B5/397 , G11B5/4886 , G11B2005/3996
摘要： A method and system provide a magnetic transducer having an air-bearing surface (ABS). The method includes providing a first shield, a first read sensor, an antiferromagnetically coupled (AFC) shield that includes an antiferromagnet, a second read sensor and a second shield. The read sensors are between the first and second shields. The AFC shield is between the read sensors. An optional anneal for the first shield is in a magnetic field at a first angle from the ABS. Anneals for the first and second read sensors are in magnetic fields in desired first and second read sensor bias directions. The AFC shield anneal is in a magnetic field at a third angle from the ABS. The second shield anneal is in a magnetic field at a fifth angle from the ABS. The fifth angle is selected based on a thickness and a desired AFC shield bias direction for the antiferromagnet.

8. 发明授权

US09472216B1 Differential dual free layer magnetic reader 有权
标题翻译：差分双自由层磁读取器
公开(公告)号：US09472216B1
公开(公告)日：2016-10-18
申请号：US14863309
申请日：2015-09-23
申请人： Western Digital (Fremont), LLC
发明人： Daniele Mauri , Savas Gider , Hui Zhao
IPC分类号： G11B5/39
CPC分类号： G11B5/3932 , G11B5/3912 , G11B5/398
摘要： A magnetic read apparatus has an air-bearing surface (ABS) and includes a differential read sensor, side bias structure(s) and rear magnetic bias structure(s). The differential read sensor includes first and second free layers and a nonmagnetic spacer layer between the first and second free layers in a down-track direction. The side bias structure(s) are adjacent to the first and second free layers in a cross-track direction perpendicular to the down-track direction. The side bias structure(s) magnetically bias the first and second free layers in the cross-track direction. The differential read sensor is between the ABS and the rear magnetic bias structure(s). The rear magnetic bias structure(s) provide a first magnetic bias for the first free layer in a first direction along a stripe height direction perpendicular to the ABS and provide a second magnetic bias for the second free layer in a second direction opposite to the first direction.
摘要翻译：磁读取装置具有空气轴承表面（ABS），并且包括差分读取传感器，侧偏压结构和后偏磁结构。差分读取传感器包括第一自由层和第二自由层以及沿着下游方向在第一和第二自由层之间的非磁性间隔层。侧偏置结构在与下轨道方向垂直的交叉轨道方向上与第一和第二自由层相邻。侧偏置结构在交叉轨道方向上磁偏置第一和第二自由层。差分读取传感器位于ABS和后部磁偏置结构之间。后磁偏置结构在垂直于ABS的条带高度方向上沿第一方向为第一自由层提供第一磁偏置，并且在与第一自由层相反的第二方向上为第二自由层提供第二磁偏压方向。

9. 发明授权

US09230565B1 Magnetic shield for magnetic recording head 有权
标题翻译：磁记录磁头磁屏
公开(公告)号：US09230565B1
公开(公告)日：2016-01-05
申请号：US14313069
申请日：2014-06-24
申请人： Western Digital (Fremont), LLC
发明人： Rongfu Xiao , Daniele Mauri , Ming Mao , Haiwen Xi
IPC分类号： G11B5/39 , G11B5/11
CPC分类号： G11B5/11 , G11B5/112 , G11B5/3912 , H01L43/02
摘要： A magnetic shield for a magnetic recording head includes a plurality of ferromagnetic layers, a spacer layer, and a buffer layer, wherein the buffer layer includes Co, Fe, B, or a combination thereof and effectively reduces irregular grain growth within the ferromagnetic layers, the spacer layer includes Ru, and the ferromagnetic layers magnetically couple through each of the buffer layer and the spacer layer.
摘要翻译：用于磁记录头的磁屏蔽包括多个铁磁层，间隔层和缓冲层，其中缓冲层包括Co，Fe，B或其组合，并且有效地减少铁磁层内的不规则晶粒生长，间隔层包括Ru，并且铁磁层通过每个缓冲层和间隔层磁耦合。

10. 发明授权

US09013836B1 Method and system for providing an antiferromagnetically coupled return pole 有权
标题翻译：提供反铁磁耦合返回极的方法和系统
公开(公告)号：US09013836B1
公开(公告)日：2015-04-21
申请号：US13894281
申请日：2013-05-14
申请人： Western Digital (Fremont), LLC
发明人： Feng Liu , Daniele Mauri
IPC分类号： G11B5/127 , G11B5/147 , G11B5/84
CPC分类号： G11B5/147 , G11B5/115 , G11B5/1278 , G11B5/3146 , G11B5/3967
摘要： A method and system provide a magnetic head having an air-bearing surface (ABS). The magnetic head includes a read transducer and a write transducer. The read transducer includes a first shield and a read sensor. The write transducer includes a main pole, at least one coil for energizing the main pole and a return pole between the read sensor and the main pole. The return pole includes an antiparallel coupling (AC) pole structure. The AC pole structure includes a plurality of ferromagnetic layers interleaved with at least one nonmagnetic layer. The ferromagnetic layers and the nonmagnetic spacer layer(s) are substantially parallel. The ferromagnetic layers and the nonmagnetic spacer layer(s) are substantially perpendicular to the ABS. The magnetic moment of each of the ferromagnetic layers is aligned antiparallel with the magnetic moment of a nearest neighbor of the ferromagnetic layers.
摘要翻译：一种方法和系统提供具有空气轴承表面（ABS）的磁头。磁头包括读换能器和写换能器。读取换能器包括第一屏蔽和读取传感器。写入传感器包括主极，用于激励主极的至少一个线圈和读取传感器与主极之间的返回极。返回极包括反平行耦合（AC）极结构。 AC极结构包括与至少一个非磁性层交错的多个铁磁层。铁磁层和非磁性间隔层基本平行。铁磁层和非磁性间隔层基本上垂直于ABS。每个铁磁层的磁矩与铁磁层最近邻的磁矩反平行排列。

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