公开(公告)号：US08981503B2

公开(公告)日：2015-03-17

申请号：US13421963

申请日：2012-03-16

申请人： Robert Beach ,  Guenole Jan ,  Yu-Jen Wang ,  Witold Kula ,  Po-Kang Wang

发明人： Robert Beach ,  Guenole Jan ,  Yu-Jen Wang ,  Witold Kula ,  Po-Kang Wang

IPC分类号： H01L43/08 ,  G11C11/16

CPC分类号： H01L43/08 ,  G11C11/161 ,  H01L27/228 ,  H01L43/12

摘要： An STT MTJ cell is formed with a magnetic anisotropy of its free and reference layers that is perpendicular to their planes of formation. The reference layer of the cell is an SAF multilayered structure with a single magnetic domain to enhance the bi-stability of the magnetoresistive states of the cell. The free layer of the cell is etched back laterally from the reference layer, so that the fringing stray field of the reference layer is no more than 15% of the coercivity of the free layer and has minimal effect on the free layer.

摘要翻译： 形成具有垂直于其形成平面的游离和参考层的磁各向异性的STT MTJ电池。 单元的参考层是具有单个磁畴的SAF多层结构，以增强单元的磁阻状态的双稳定性。 电池的自由层从参考层横向回蚀刻，使得参考层的边缘杂散场不超过自由层的矫顽力的15％，并且对自由层的影响最小。

公开(公告)号：US08593915B2

公开(公告)日：2013-11-26

申请号：US13136462

申请日：2011-08-01

申请人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

发明人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

摘要： A slider mounted TAMR (Thermal Assisted Magnetic Recording), DFH (Dynamic Flying Height) type read/write head using optical-laser generated surface plasmons in a small antenna to locally heat a magnetic medium, uses the same optical laser at low power to pre-heat the antenna. Maintaining the antenna at this pre-heated temperature, approximately 50% of its highest temperature during write operations, allows the DFH mechanism sufficient time to compensate for the thermal protrusion of the antenna at that lower temperature, so that thermal protrusion transients are significantly reduced when a writing operation occurs and full laser power is applied. The time constant for antenna protrusion is less than the time constant for DFH fly height compensation, so, without pre-heating, the thermal protrusion of the antenna due to absorption of optical radiation cannot be compensated by the DFH effect.

摘要翻译： 使用在小天线中使用光学激光产生的表面等离子体激光器来局部加热磁介质的TAMR（热辅助磁记录），DFH（动态飞行高度）型读/写头的滑块，以低功率使用相同的光学激光器 - 加热天线。 将天线维持在该预热温度下，在写入操作期间其最高温度的约50％允许DFH机构有足够的时间来补偿在该较低温度下的天线的热突起，使得热突起瞬变显着降低 发生写入操作并施加全激光功率。 天线突起的时间常数小于DFH飞行高度补偿的时间常数，因此，在没有预热的情况下，由于吸收光辐射而导致的天线热突起不能被DFH效应补偿。

公开(公告)号：US20120169331A1

公开(公告)日：2012-07-05

申请号：US13417398

申请日：2012-03-12

申请人： Po-Kang Wang ,  Xizeng Shi ,  Chyu-Jiuh Torng

发明人： Po-Kang Wang ,  Xizeng Shi ,  Chyu-Jiuh Torng

IPC分类号： G01R33/02 ,  H05K3/00

CPC分类号： G01R33/0052 ,  B82Y25/00 ,  G01N15/0656 ,  G01N27/745 ,  G01N2015/0065 ,  G01R33/05 ,  G01R33/093 ,  G01R33/098 ,  Y10T29/49124 ,  Y10T29/49986

摘要： A GMR sensor stripe provides a sensitive mechanism for detecting the presence of magnetized particles bonded to biological molecules that are affixed to a substrate. The adverse effect of hysteresis on the maintenance of a stable bias point for the magnetic moment of the sensor stripe free layer is eliminated by a combination of biasing the sensor stripe along its longitudinal direction rather than the usual transverse direction and by using the overcoat stress and magnetostriction of magnetic layers to create a compensatory transverse magnetic anisotropy. By connecting the stripes in an array and making the spaces between the stripes narrower than the dimension of the magnetized particle and by making the width of the stripes equal to the dimension of the particle, the sensitivity of the sensor array is enhanced.

摘要翻译： GMR传感器条带提供用于检测粘附到固定到基底上的生物分子的磁化颗粒的存在的敏感机制。 通过将传感器条沿其纵向而不是通常的横向方向偏置并通过使用外涂层应力和组合来消除滞后对传感器无条纹层的磁矩的稳定偏置点的维持的不利影响 磁层的磁致伸缩产生补偿横向磁各向异性。 通过将条纹连接在阵列中，使得条纹之间的空间比磁化粒子的尺寸窄，并且通过使条纹的宽度等于粒子的尺寸，增强了传感器阵列的灵敏度。

公开(公告)号：US20120075749A1

公开(公告)日：2012-03-29

申请号：US12924416

申请日：2010-09-27

申请人： Yan Wu ,  Moris Dovek ,  Zhigang Bai ,  Cherng Chyi Han ,  Jiun-Ting Lee ,  Po-Kang Wang

发明人： Yan Wu ,  Moris Dovek ,  Zhigang Bai ,  Cherng Chyi Han ,  Jiun-Ting Lee ,  Po-Kang Wang

IPC分类号： G11B5/127 ,  G11B5/10

CPC分类号： G11B5/1278 ,  G11B5/3116 ,  G11B5/3163

摘要： A perpendicular magnetic recording (PMR) head is fabricated with a tapered main pole having a variable thickness. The tapered portion of the pole is at the ABS tip and it can be formed by bevels at the leading or trailing edges or both. The taper terminates to form a region with a maximum thickness, t1, which extends for a certain distance proximally. Beyond this region of maximum thickness t1, the pole is then reduced to a constant minimum thickness t2. A yoke is attached to this region of constant minimum thickness. This pole design requires less flux because of the thinner region of the pole where it attaches to the yoke, but the thicker region just before the tapered ABS provides additional flux to drive the pole just before the ABS, so that high definition and field gain is achieved, yet fringing is significantly reduced.

公开(公告)号：US08089265B2

公开(公告)日：2012-01-03

申请号：US12321772

申请日：2009-01-26

申请人： Yimin Guo ,  Po-Kang Wang

发明人： Yimin Guo ,  Po-Kang Wang

IPC分类号： G01R15/18 ,  G01R33/02

CPC分类号： G01R33/093 ,  B82Y25/00 ,  B82Y40/00 ,  G01R15/205 ,  G01R33/098 ,  G11B5/3932 ,  H01F10/3254 ,  H01F10/3277 ,  H01F41/302

摘要： By subdividing the free layer of a GMR/TMR device into multiple sub-elements that share common top and bottom electrodes, a magnetic detector is produced that is domain stable in the presence of large stray fields, thereby eliminating the need for longitudinal bias magnets. Said detector may be used to measure electric currents without being affected by local temperature fluctuations and/or stray fields.

摘要翻译： 通过将GMR / TMR器件的自由层细分成共享共同的顶部和底部电极的多个子元件，产生在大的杂散场存在下稳定的磁性检测器，从而不需要纵向偏置磁体。 所述检测器可用于测量电流而不受局部温度波动和/或杂散场的影响。

公开(公告)号：US20110292773A1

公开(公告)日：2011-12-01

申请号：US13136462

申请日：2011-08-01

申请人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

发明人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

摘要： A slider mounted TAMR (Thermal Assisted Magnetic Recording), DFH (Dynamic Flying Height) type read/write head using optical-laser generated surface plasmons in a small antenna to locally heat a magnetic medium, uses the same optical laser at low power to pre-heat the antenna. Maintaining the antenna at this pre-heated temperature, approximately 50% of its highest temperature during write operations, allows the DFH mechanism sufficient time to compensate for the thermal protrusion of the antenna at that lower temperature, so that thermal protrusion transients are significantly reduced when a writing operation occurs and full laser power is applied. The time constant for antenna protrusion is less than the time constant for DFH fly height compensation, so, without pre-heating, the thermal protrusion of the antenna due to absorption of optical radiation cannot be compensated by the DFH effect.

公开(公告)号：US08045295B2

公开(公告)日：2011-10-25

申请号：US12145464

申请日：2008-06-24

申请人： Yen Fu ,  Ellis T. Cha ,  Po-Kang Wang ,  Hong Tian ,  Manuel Hernandez ,  Yaw-Shing Tang ,  Ben Hu

发明人： Yen Fu ,  Ellis T. Cha ,  Po-Kang Wang ,  Hong Tian ,  Manuel Hernandez ,  Yaw-Shing Tang ,  Ben Hu

IPC分类号： G11B5/55

CPC分类号： H05K3/3442 ,  B24B37/00 ,  B24D18/00 ,  G11B5/4853 ,  H05K1/0215 ,  H05K2201/10727 ,  Y02P70/613

摘要： Method and apparatus are presented for electrically coupling a slider to ground. In one embodiment, a bonding pad is provided on a side of the slider body separate from the bonding pad(s) used for read/write signals. This separate bonding pad is electrically coupled within the slider body to components that are to be coupled to ground. A separate conductor provided on the suspension (e.g., a trace, a flex circuit, etc.) may be electrically coupled to the separate bonding pad via gold ball bonding. The conductor is also coupled to ground in the hard-disk drive device (e.g., via the preamplifier). The use of the separated bonding pad and trace may negate the need to use a conductive adhesive to electrically ground the slider via its attachment to the tongue of a slider.

摘要翻译： 呈现用于将滑块电耦合到地面的方法和装置。 在一个实施例中，接合焊盘设置在与用于读/写信号的接合焊盘分开的滑块体的一侧上。 该单独的接合焊盘在滑块体内电耦合到要耦合到地面的部件。 设置在悬架上的单独的导体（例如，迹线，柔性电路等）可以通过金球接合电耦合到单独的接合焊盘。 导体也耦合到硬盘驱动装置中的接地（例如，经由前置放大器）。 使用分离的接合焊盘和迹线可能会使得不需要使用导电粘合剂来将滑块经由其附接件电连接到滑块的舌部。

公开(公告)号：US07995425B2

公开(公告)日：2011-08-09

申请号：US12381327

申请日：2009-03-11

申请人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

发明人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

摘要： A slider mounted TAMR (Thermal Assisted Magnetic Recording), DFH (Dynamic Flying Height) type read/write head using optical-laser generated surface plasmons in a small antenna to locally heat a magnetic medium, uses the same optical laser at low power to pre-heat the antenna. Maintaining the antenna at this pre-heated temperature, approximately 50% of its highest temperature during write operations, allows the DFH mechanism sufficient time to compensate for the thermal protrusion of the antenna at that lower temperature, so that thermal protrusion transients are significantly reduced when a writing operation occurs and full laser power is applied. The time constant for antenna protrusion is less than the time constant for DFH fly height compensation, so, without pre-heating, the thermal protrusion of the antenna due to absorption of optical radiation cannot be compensated by the DFH effect.

摘要翻译： 使用在小天线中使用光学激光产生的表面等离子体激光器来局部加热磁介质的TAMR（热辅助磁记录），DFH（动态飞行高度）型读/写头的滑块，以低功率使用相同的光学激光器 - 加热天线。 将天线维持在该预热温度下，在写入操作期间其最高温度的约50％允许DFH机构有足够的时间来补偿在该较低温度下的天线的热突起，使得热突起瞬变显着降低 发生写入操作并施加全激光功率。 天线突起的时间常数小于DFH飞行高度补偿的时间常数，因此，在没有预热的情况下，由于吸收光辐射而导致的天线热突起不能被DFH效应补偿。

公开(公告)号：US07852662B2

公开(公告)日：2010-12-14

申请号：US11789324

申请日：2007-04-24

申请人： Hsu Kai Yang ,  Po-Kang Wang

发明人： Hsu Kai Yang ,  Po-Kang Wang

IPC分类号： G11C11/00

CPC分类号： G11C11/16

摘要： A spin-torque MRAM array has MRAM cells arranged in rows and columns. Bit lines are connected to each of the MRAM cells on each column. Source select lines are connected to each MRAM cell of a pair of rows and are oriented orthogonally to the bit lines. Write lines are connected to the gate of the gating MOS transistor of each MRAM cell of the rows. The MRAM cells are written in a two step process with selected MRAM cells written to a first logic level (0) in a first step and selected MRAM cells written to a second logic level (1) in a second step. A second embodiment of the spin-torque MRAM array has the bit lines commonly connected together to receive the data and the source select lines commonly connected together to receive an inverse of the data for writing.

摘要翻译： 自旋扭矩MRAM阵列具有以行和列排列的MRAM单元。 位线连接到每列上的每个MRAM单元。 源选择线连接到一对行的每个MRAM单元并且与位线正交地定向。 写入线连接到行的每个MRAM单元的选通MOS晶体管的栅极。 MRAM单元以两步过程写入，在第一步骤中将所选MRAM单元写入第一逻辑电平（0），并在第二步骤中将所选择的MRAM单元写入第二逻辑电平（1）。 自旋扭矩MRAM阵列的第二实施例具有通常连接在一起的位线，以接收通常连接在一起的数据和源选择线，以接收用于写入的数据的倒数。

公开(公告)号：US07635974B2

公开(公告)日：2009-12-22

申请号：US11799706

申请日：2007-05-02

申请人： Yimin Guo ,  Po-Kang Wang

发明人： Yimin Guo ,  Po-Kang Wang

IPC分类号： G01B7/30

CPC分类号： G01R33/093 ,  B82Y25/00 ,  G01R33/098

摘要： A magnetic field angle sensor for measurement of a magnetic field angle over a 360° range has magnetic tunnel junction elements oriented at multiple angles. The magnetic field angle sensor includes multiple magnetic tunnel junction elements formed on a substrate that have an anti-ferromagnetic layer and pinned synthetic multiple layer. The magnetic tunnel junction elements are patterned to have a large dimensional aspect ratio and large anisotropies the pinned synthetic multiple layer of the magnetic tunnel junction elements. The magnetic tunnel junction elements are annealed in the presence of a strong magnetic field in a direction of the reference axis and the annealed for a second time with no external magnetic field so that exchange pinning is reduced and strong stress induced anisotropies of the pinned synthetic multiple layer align magnetization of the pinned synthetic multiple layer align a long axis of each of the magnetic tunnel junction elements.

摘要翻译： 用于测量360°范围内的磁场角的磁场角传感器具有以多个角度定向的磁性隧道结元件。 磁场角传感器包括形成在具有反铁磁层和固定合成多层的基板上的多个磁性隧道结元件。 磁性隧道结元件被图案化以具有大的尺寸长宽比和大的各向异性的磁性隧道结元件的被钉合的合成多层。 磁性隧道结元件在存在强磁场的情况下在参考轴的方向上进行退火，并且在没有外部磁场的情况下第二次退火，从而减少了交换钉扎和强制应力引起的固定合成倍数的各向异性 钉扎合成多层的层对准磁化使每个磁性隧道结元件的长轴对齐。