公开(公告)号：US5005096A

公开(公告)日：1991-04-02

申请号：US287970

申请日：1988-12-21

申请人： Mohamad T. Krounbi ,  Po-Kang Wang ,  Otto Voegeli

发明人： Mohamad T. Krounbi ,  Po-Kang Wang ,  Otto Voegeli

IPC分类号： G11B5/39

CPC分类号： G11B5/3903 ,  G11B5/3932

摘要： A magnetoresistive (MR) read transducer comprising an MR layer having passive end regions separated by a central active region. A longitudinal bias is produced by a thin film of hard magnetic material in the end regions only, and the thin film of hard magnetic material is spaced from the MR layer by a nonmagnetic spacer layer so that a magnetostatic longitudinal bias is produced of a level to maintain the passive end regions of the MR layer in a stable state.

公开(公告)号：US5079035A

公开(公告)日：1992-01-07

申请号：US629503

申请日：1990-12-18

申请人： Mohamad T. Krounbi ,  Otto Voegeli ,  Po-Kang Wang

发明人： Mohamad T. Krounbi ,  Otto Voegeli ,  Po-Kang Wang

IPC分类号： G11B5/39

CPC分类号： G11B5/3903 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49067

摘要： A magnetoresistive (MR) read transducer having passive end regions separated by a central active region in which an MR layer is formed which extends over substantially only the central active region and in which a hard magnetic layer is formed in each end region. The hard magnetic layers form an abutting junction having electrical and magnetic continuity with the MR layer to produce a longitudinal bias in the MR sensor. The transducer is produced by a method in which the same stencil defines the extent of both the MR layer and the hard magnetic layers so that the abutting junctions are formed easily and reliably.

摘要翻译： 磁阻（MR）读取传感器，其具有被中心有源区域分开的被动端区域，其中形成MR层，其基本上仅在中心有源区域上延伸，并且在每个端部区域中形成硬磁性层。 硬磁性层形成与MR层具有电连接性和磁性连续性的邻接结，以在MR传感器中产生纵向偏置。 传感器通过一种方法制造，其中相同的模版限定了MR层和硬磁性层的程度，使得邻接接合部容易且可靠地形成。

公开(公告)号：US5018037A

公开(公告)日：1991-05-21

申请号：US419246

申请日：1989-10-10

申请人： Mohamad T. Krounbi ,  Otto Voegeli ,  Po-Kang Wang

发明人： Mohamad T. Krounbi ,  Otto Voegeli ,  Po-Kang Wang

IPC分类号： G11B5/39

CPC分类号： G11B5/3903

摘要： A magnetoresistive (MR) read transducer having passive end regions separated by a central active region in which an MR layer is formed which extends over substantially only the central active region and in which a hard magnetic layer is formed in each end region. The hard magnetic layers form an abutting junction having electrical and magnetic continuity with the MR layer to produce a longitudinal bias in the MR sensor. The transducer is produced by a method in which the same stencil defines the extent of both the MR layer and the hard magnetic layers so that the abutting junctions are formed easily and reliably.

公开(公告)号：US5285339A

公开(公告)日：1994-02-08

申请号：US843702

申请日：1992-02-28

申请人： Mao-Min Chen ,  Kochan Ju ,  Mohamad T. Krounbi ,  Ching H. Tsang ,  Po-Kang Wang

发明人： Mao-Min Chen ,  Kochan Ju ,  Mohamad T. Krounbi ,  Ching H. Tsang ,  Po-Kang Wang

IPC分类号： G11B5/39 ,  G11B5/127

CPC分类号： G11B5/3903

摘要： An MR read transducer having passive end regions separated by a central active region comprises an MR layer made from a material having a low uniaxial magnetic anisotropy. A soft magnetic bias layer is adjacent to but spaced from the MR layer in the central region only, and the soft magnetic bias layer is made from a material having a high uniaxial magnetic anisotropy. A longitudinal bias is produced directly in each of the end regions only, and the means for producing the longitudinal bias comprise a layer made from a material having a high uniaxial magnetic anisotropy. Control of the uniaxial anisotropy can be achieved by choosing materials of appropriate magnetostriction or intrinsic uniaxial anisotropy.

摘要翻译： 具有由中心有源区域分离的无源端区域的MR读取传感器包括由具有低单轴磁各向异性的材料制成的MR层。 软磁偏置层仅与中心区域中的MR层相邻但间隔开，并且软磁偏置层由具有高单轴磁各向异性的材料制成。 仅在每个端部区域中直接产生纵向偏压，并且用于产生纵向偏压的装置包括由具有高单轴磁各向异性的材料制成的层。 单轴各向异性的控制可以通过选择适当的磁致伸缩材料或固有单轴各向异性来实现。

公开(公告)号：US5079663A

公开(公告)日：1992-01-07

申请号：US471576

申请日：1990-01-29

申请人： Kochan Ju ,  Mohamad T. Krounbi ,  Po-Kang Wang

发明人： Kochan Ju ,  Mohamad T. Krounbi ,  Po-Kang Wang

IPC分类号： G11B5/33 ,  G11B5/39 ,  G11B5/58 ,  H01L43/08

CPC分类号： G11B5/58 ,  G11B5/39

摘要： A magnetoresistive (MR) sensor is center tapped to provide the difference signals for servo operation on data and sum signals for the data information. The center-tap of the MR sensor is made of a high resistivity material compared to the resistivity of the MR element itself such as tantalum, Nichrome and carbon. Processes which can be used to produce the high resistivity center-tap conductor include an insulator layer to define both the track width and the center-tap conductor and a sequence which first patterns the MR sensor and then masks to define the conductor regions.

公开(公告)号：US5452165A

公开(公告)日：1995-09-19

申请号：US214902

申请日：1994-03-16

申请人： Mao-Min Chen ,  Kochan Ju ,  Mohamad T. Krounbi ,  Denny D. Tang ,  Po-Kang Wang

发明人： Mao-Min Chen ,  Kochan Ju ,  Mohamad T. Krounbi ,  Denny D. Tang ,  Po-Kang Wang

IPC分类号： G11B5/008 ,  G11B5/012 ,  G11B5/31 ,  G11B5/48 ,  G11B5/56 ,  G11B5/584 ,  G11B5/29

CPC分类号： G11B5/3103 ,  G11B5/3183 ,  G11B5/4886 ,  G11B5/4893 ,  G11B5/56 ,  G11B5/584 ,  G11B5/00817 ,  G11B5/012

摘要： The present invention includes a plurality of thin film magnetic heads which are arranged in a linear array with a spacing D between adjacent heads. The pole pieces of the magnetic heads are positioned in a side by side relationship in contrast to the normal pancake type of magnetic head. The linear array is angled at a skew angle .theta. with respect to the direction of travel of the magnetic medium. The track pitch is then D sin .theta.. The track width is substantially equal to the thickness of the pole tips P1T and P2T of the magnetic heads. This thickness can be in the order of 3 .mu.m. With such a pole tip thickness the track pitch of each magnetic head in the linear array can be 3-4 .mu.m. A plurality of narrow data tracks can then be provided with minimum pitch by a corresponding number of magnetic heads. The write signals are simultaneously fed to the heads or the read signals are simultaneously fed to the heads. This allows high data rates to be processed. The invention also provides different azimuth between adjacent heads to minimize cross talk between the tracks caused by track misregistration. Additional magnetic heads can be employed for servo control as needed.

摘要翻译： 本发明包括多个薄膜磁头，其以相邻磁头之间的间隔D布置成线性阵列。 与正常的煎饼型磁头相反，磁头的极片与并排的关系定位。 线性阵列相对于磁性介质的行进方向以偏斜角θ成角度。 轨道间距为Dsinθ。 轨道宽度基本上等于磁头的极尖P1T和P2T的厚度。 该厚度可以在3μm左右。 具有这样的极尖厚度，线阵列中每个磁头的轨道间距可以是3-4μm。 然后可以通过相应数量的磁头以最小间距来提供多个窄数据轨道。 写入信号被同时馈送到头部，或者读取信号被同时馈送到头部。 这样可以处理高数据速率。 本发明还提供相邻头部之间的不同方位角，以最小化由轨道重合失调引起的轨道之间的串扰。 可根据需要使用额外的磁头进行伺服控制。

公开(公告)号：US5375023A

公开(公告)日：1994-12-20

申请号：US998171

申请日：1992-12-29

申请人： Kochan Ju ,  Mohamad T. Krounbi ,  Po-Kang Wang

发明人： Kochan Ju ,  Mohamad T. Krounbi ,  Po-Kang Wang

IPC分类号： G11B5/31 ,  G11B5/23 ,  G11B5/127 ,  G11B5/147

CPC分类号： G11B5/3163 ,  G11B5/3116

摘要： A thin film inductive head having staggered pole-tips with a self-aligned recording gap region. The recording gap region is bounded by stepped pole-tip element with the steps made large with respect to the gap thickness. The pole-tip layers extend back from the air bearing surface to form a throat region that is also large with respect to the gap thickness. The self-aligned staggered pole-tip geometry is suitable for submicron track widths because the pole-tips may themselves be much wider and the self-aligned configuration avoids submicron masking and registration difficulties. The stepped pole-tip surfaces also eliminate the side-writing problem known in the art for overlapping thin film poles.

摘要翻译： 具有具有自对准记录间隙区域的交错极尖的薄膜感应头。 记录间隙区域由步进的极尖元件限定，相对于间隙厚度的步长较大。 极尖层从空气支承表面向后延伸以形成相对于间隙厚度也很大的喉部区域。 自对准交错极尖几何形状适用于亚微米轨道宽度，因为极尖本身可能宽得多，并且自对准配置避免了亚微米掩蔽和配准困难。 阶梯式极尖表面也消除了本领域已知的用于重叠薄膜极的侧面写入问题。

公开(公告)号：US06358635B1

公开(公告)日：2002-03-19

申请号：US09467138

申请日：1999-12-20

申请人： Tai Min ,  Otto Voegeli ,  Rongfu Xiao ,  Cherng-Chyi Han ,  Po-Kang Wang

发明人： Tai Min ,  Otto Voegeli ,  Rongfu Xiao ,  Cherng-Chyi Han ,  Po-Kang Wang

IPC分类号： G11B566

CPC分类号： B82Y10/00 ,  G11B5/11 ,  G11B5/115 ,  G11B5/3109 ,  G11B5/313 ,  G11B5/3903 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/1171 ,  Y10T428/1193 ,  Y10T428/265

摘要： A magnetic shielding element for a magnetic recording and sensing device which prevents the problem of pop-corn noise or covariance of amplitude noise in the magnetic sensing device. The shielding element has a layer of antiferromagnetic exchange material formed on a layer of single domain first ferromagnetic material. The single domain first ferromagnetic material is stabilized by the antiferromagnetic exchange material. A layer of non-magnetic metal is then formed on the layer of antiferromagnetic exchange material and a layer of second ferromagnetic material is formed on the layer of non-magnetic metal to complete the shielding element. When the single domains of the first ferromagnetic material are disturbed by the strong magnetic fields of a write cycle they relax with a relaxation time of pico seconds and are fully relaxed before a read cycle begins. The fully relaxed layer of first ferromagnetic material then shields the magnetic sensing device from magnetic field fluctuations caused by the slower relaxation of the domains in the layer of second ferromagnetic material during a read cycle.

摘要翻译： 一种用于磁记录和感测装置的磁屏蔽元件，其防止弹性玉米噪声或磁感测装置中振幅噪声的协方差问题。 屏蔽元件具有形成在单畴第一铁磁材料层上的反铁磁交换材料层。 单畴第一铁磁材料由反铁磁交换材料稳定。 然后在反铁磁交换材料层上形成一层非磁性金属，并在非磁性金属层上形成一层第二铁磁材料，以完成屏蔽元件。 当第一铁磁材料的单个畴被写入周期的强磁场干扰时，它们以微微秒的弛豫时间放松，并且在读周期开始之前完全松弛。 第一铁磁材料的完全松弛层然后屏蔽磁感测装置免受在读周期期间由第二铁磁材料层中的畴的较慢松弛引起的磁场波动。

公开(公告)号：US08728825B2

公开(公告)日：2014-05-20

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： G01N27/00

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：US08184399B2

公开(公告)日：2012-05-22

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

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.

摘要翻译： 制造具有可变厚度的锥形主极的垂直磁记录（PMR）头。 极的锥形部分在ABS尖端处，并且其可以由前缘或后缘处的斜面或两者形成。 锥形终止形成最大厚度的区域t1，其向近处延伸一定距离。 超过该最大厚度的区域t1，然后将极减小到恒定的最小厚度t2。 磁轭连接到恒定最小厚度的区域。 这个极设计需要更少的通量，因为它附着在磁轭上的磁极的较薄区域，而刚好在锥形ABS之前较厚的区域提供额外的磁通来驱动刚好在ABS之前的极点，因此高清晰度和场增益是 实现了，但边缘明显减少。