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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
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。
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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
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。
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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
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.
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4.发明授权
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
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。
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5.发明授权Method of making a magnetoresistive read transducer having hard magnetic bias 失效制造具有硬磁偏置的磁阻读取传感器的方法
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。
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公开(公告)号：US5458908A
公开(公告)日：1995-10-17
申请号：US310906
申请日：1994-09-21
CPC分类号： G11B5/399 , G11B5/3906 , G11B5/40
摘要： A magnetoresistive (MR) read transducer assembly having passive end regions separated by a central active region, and a method of fabricating it. Layers of a first biasing material and a nonmagnetic decoupling spacer material are deposited on a substrate, then covered by a mask only in the central region. By etching or ion milling, those parts of the layers not covered by the mask are removed to define a transverse biasing means in the central region and define the passive end regions. With the same mask remaining in place, a conductive material and exchange layer comprising a second biasing material are deposited over all regions. The mask is removed to define and provide conductor leads and longitudinal biasing means only in the end regions. MR material is thereafter deposited as a continuous thin film in direct contact with the central region containing the transverse biasing means and in direct contact with the end regions containing the longitudinal biasing means. This fabrication technique has no critical etching steps requiring stopping at or near a particular interface and the MR film provides a continuous platform for carrying current without butted junctions in the current path.
摘要翻译： 具有由中心有源区域分离的被动端区域的磁阻（MR）读取换能器组件及其制造方法。 第一偏置材料和非磁性去耦隔离材料的层沉积在基底上，然后仅在中心区域被掩模覆盖。 通过蚀刻或离子研磨，去除未被掩模覆盖的层的那些部分以在中心区域中限定横向偏置装置并且限定被动端部区域。 在相同的掩模保持就位的情况下，在所有区域上沉积包括第二偏置材料的导电材料和交换层。 去除掩模以限定并仅在端部区域中提供导体引线和纵向偏置装置。 然后，MR材料作为连续的薄膜沉积，其与包含横向偏置装置的中心区域直接接触并与包含纵向偏置装置的端部区域直接接触。 该制造技术没有要求在特定界面处或附近停止的关键蚀刻步骤，并且MR膜提供用于在当前路径中承载没有对接结的电流的连续平台。
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公开(公告)号：US5438747A
公开(公告)日：1995-08-08
申请号：US208398
申请日：1994-03-09
CPC分类号： G11B5/3967 , G11B5/3116 , G11B5/3163 , Y10T29/49048
摘要： A merged MR head is provided which has vertically aligned sidewalls so as to minimize side-fringing and improve off-track performance. The bottom pole piece P1, which comprises the second shield layer S2 of the read head, has a pedestal pole tip with a short length dimension. A pedestal pole tip with a length as short as two times the length of the gap layer G optimally minimizes the sidewriting and improves off-track performance. The bottom pole tip structure of the write head is constructed by ion beam milling using the top pole tip structure as a mask. The ion beam milling is directed at an angle to the sidewalls of the top pole tip structure which causes the bottom pole tip structure to be milled with sidewalls which align with the top pole tip structure. The ion beam milling can comprise two angled beams, either sequentially or simultaneously, the first beam performing primarily a cutting operation and some clean up work while the second beam primarily conducts clean up work of the redeposition of the debris caused by the cutting. In another embodiment, a single angled ion beam can be employed, provided its angle is within a particular range.
摘要翻译： 提供了具有垂直对齐的侧壁的合并的MR头，以便使边缘最小化并且提高离轨性能。 包括读取头的第二屏蔽层S2的底极片P1具有短长度尺寸的基座极头。 长度短到间隙层G的长度的两倍的基座极尖最优化了笔迹的最小化并改善了离轨性能。 写头的底极尖端结构是通过使用顶极尖端结构作为掩模的离子束铣削构成的。 离子束铣削与顶极尖端结构的侧壁成一角度地引导，这导致底极尖端结构被与顶极尖端结构对准的侧壁铣削。 离子束铣削可以包括两个成角度的梁，顺序地或同时地，第一梁主要执行切割操作和一些清理工作，而第二梁主要进行由切割引起的碎片的再沉积的清理工作。 在另一个实施例中，只要其角度在特定范围内即可使用单角度离子束。
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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.
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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.
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公开(公告)号：US5617277A
公开(公告)日：1997-04-01
申请号：US589813
申请日：1996-01-22
申请人： Mao-Min Chen , Mohamad T. Krounbi
发明人： Mao-Min Chen , Mohamad T. Krounbi
CPC分类号： G11B5/3929 , G11B5/3103
摘要： A magnetic disk storage system with high linear resolution magnetoresistive (MR) head or heads comprising a dielectric substrate, a first magnetic shield, a first gap insulation layer, an MR stripe element, conductive leads, a second gap insulation layer, and a second magnetic shield. Back-fill layers of insulation material are deposited on the first gap insulation layer adjacent the MR element and/or on the second gap insulation layer in thicknesses substantially sufficient to at least in part replace insulation material removed during the various processing steps to ensure against short circuiting of the MR element. The MR element preferably is a trilayer comprising a soft MR sensing layer biased at an acute angle to the lengthwise dimension of the element but free to rotate therefrom according to the magnitude and direction of applied magnetic field; a soft magnetic or hard magnetic layer with magnetization fixed in a direction perpendicular to the lengthwise direction of the MR element; and a spacer layer separating these two layers.
摘要翻译： 一种具有高线性分辨率磁阻（MR）磁头或磁头的磁盘存储系统，包括电介质基板，第一磁屏蔽，第一间隙绝缘层，MR条形元件，导电引线，第二间隙绝缘层和第二磁 屏蔽。 绝缘材料的填充层沉积在与MR元件相邻的第一间隙绝缘层和/或第二间隙绝缘层上，其厚度基本上足以至少部分地替代在各种加工步骤期间去除的绝缘材料，以确保短时间 MR元件的回路。 MR元件优选是三层，其包括根据所施加的磁场的大小和方向以与该元件的纵向尺寸成锐角倾斜的柔性MR感测层，但可自由旋转; 软磁性或硬磁性层，其磁化方向固定在与MR元件的长度方向垂直的方向上; 以及分隔这两层的间隔层。
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