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1.发明授权Magneto-resistive sensor with opposing currents for reading perpendicularly recorded media 失效具有相反电流的磁阻传感器，用于读取垂直记录的介质
公开(公告)号：US4878140A
公开(公告)日：1989-10-31
申请号：US209651
申请日：1988-06-21
CPC分类号： G11B5/3954 , G11B19/04 , G11B5/02 , G11B5/1278 , G11B5/39 , G11B5/3903 , G11B2005/0029
摘要： A sensor for reading perpendicularly recorded media includes dual magneto-resistive elements. Directionally opposed currents through respective elements each serve both sensing and bias functions. A detector differentially detects changes in the resistance of the stripes so as to presume common mode noise rejection when reading perpendicular recording media. In addition, the opposing currents offset each other's interaction with the soft magnetic underlayer of the media, which interaction could otherwise perturb the information stored on the media. Provision is made for switching the relative direction of current flow to provide for reading longitudinally recorded media.
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2.发明授权Nondestructive M-H hysteresis testers for magnetic discs for computer disc drives 失效用于计算机磁盘驱动器的磁盘的非破坏性M-H磁滞测试仪
公开(公告)号：US4843316A
公开(公告)日：1989-06-27
申请号：US144690
申请日：1988-01-13
申请人： Victor W. Hesterman
发明人： Victor W. Hesterman
IPC分类号： G01R33/14
CPC分类号： G01R33/14
摘要： The manufacture of digital magnetic recording discs for computer disc drives requires the monitoring and control of the M-H hysteresis loop properties of the magnetic film deposited on the disc substrate. Several methods exist for measuring this M-H hysteresis loop, but they all have serious disadvantages. One method consists of cutting samples and measuring them with a vibrating sample magnetometer. This is a destructive test and requires a lot of time per sample. Another method uses the Kerr-rotation of polarized light. However, it samples only the mangetization of the surface and cannot determine the magnetic thickness of the film. A third method magnetizes the entire disc and samples a large region along a diameter. This method cannot distinguish between the top and bottom films of the disc, and cannot resolve circumferential variations of th M-H loop properties. The method of this invention solves these problems by measuring a small part of one surface of the disc nondestructively using a special balanced head having two air gaps. It is fast, requiring only about 2 minutes per measurement and has good reproducability.
摘要翻译： 用于计算机磁盘驱动器的数字磁记录盘的制造需要监测和控制沉积在盘基片上的磁膜的M-H磁滞回线特性。 存在用于测量该M-H磁滞回线的几种方法，但它们都具有严重的缺点。 一种方法包括切割样品并用振动样品磁力计测量它们。 这是一个破坏性测试，每个样本需要很多时间。 另一种方法使用偏振光的克尔旋转。 然而，它仅仅采样表面的封装，并且不能确定膜的磁性厚度。 第三种方法磁化整个圆盘，并沿着一个直径对大的区域进行采样。 该方法无法区分盘的顶部和底部膜，并且不能解决M-H回路特性的周向变化。 本发明的方法通过使用具有两个气隙的特殊平衡头非破坏性地测量盘的一个表面的一小部分来解决这些问题。 速度快，每次测量只需要2分钟，具有良好的重现性。
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公开(公告)号：US3976938A
公开(公告)日：1976-08-24
申请号：US530625
申请日：1974-12-09
申请人： Victor W. Hesterman
发明人： Victor W. Hesterman
IPC分类号： G01R33/035 , G01R33/02
CPC分类号： G01R33/035 , Y10S505/845
摘要： A superconducting magnetic sensor having a sensing coil is provided with one or more superconducting discs for adjusting the effective area of the coil. The effective area of the coil is adjusted by varying the position of the superconducting disc relative to the associated coil. In a superconducting gradiometer having a pair of sensing coils coupled in series opposition, three superconducting discs are arranged to provide effective area adjustment along three mutually orthogonal axes. Coarse and fine adjustment are optionally provided by employing two sets of superconducting discs, one set fixed, the other adjustable.
摘要翻译： 具有感测线圈的超导磁传感器设置有一个或多个超导盘，用于调节线圈的有效面积。 通过改变超导盘相对于相关线圈的位置来调节线圈的有效面积。 在具有串联耦合的一对感测线圈的超导梯度计中，布置三个超导盘，以沿着三个相互正交的轴线提供有效的面积调整。 通过使用两组超导盘，一组固定，另一组可调节，可选地提供粗调和微调。
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4.发明授权Improved magnetoresistive transducer with substantially perpendicular easy axis 失效改进的磁阻换能器具有基本垂直的容易轴
公开(公告)号：US5307226A
公开(公告)日：1994-04-26
申请号：US894415
申请日：1992-06-05
CPC分类号： G11B5/3932 , G11B5/3903 , G11B5/3954
摘要： A magnetoresistive transducer includes at least one magnetoresistive element having a transverse easy axis. The use of a transverse easy axis prevents magnetic domains from forming in the magnetoresistive elements and results in a noise-free device. Various techniques for producing a transverse easy axis include the use of stress, and a magneto strictive material, during the formation of the element to orient the anisotropy of the element transverse to orient the anisotropy of the element transverse to the element, formation of the element in the presence of a magnetic field, high temperature anneal of the element, or any other method of forming the element with a prebiased state.
摘要翻译： 磁阻换能器包括至少一个具有横向容易轴的磁阻元件。 使用横向易轴防止在磁阻元件中形成磁畴，并导致无噪声的装置。 用于产生横向容易轴的各种技术包括在形成元件期间使用应力和磁致伸缩材料，以横向定向元件的各向异性以定向横向于元件的元件的各向异性，元件的形成 在存在磁场的情况下，元件的高温退火，或以预偏置状态形成元件的任何其它方法。
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公开(公告)号：US5434733A
公开(公告)日：1995-07-18
申请号：US198820
申请日：1994-02-18
CPC分类号： G11B5/3925 , G11B5/245 , G11B5/3183 , G11B5/3967
摘要： A planar silicon magnetoresistive read/write head has separate read and write gaps that can be individually optimized. The write gap includes a write gap shunt that suppresses signals that are read across the write gap without interfering with the ability of the head to generate write signals at the write gap. The head retains both the advantages of removing the magnetoresistive element from the air bearing surface to avoid wear, shorting, and corrosion, and to eliminate cross-track asymmetry, associated with dual gap magnetoresistive heads; and the advantages of low cost fabrication and high area density, associated with silicon planar head structures.
摘要翻译： 平面硅磁阻读/写头具有单独的读和写间隙，可以单独优化。 写间隙包括写间隙分流，其抑制在写间隙读取的信号，而不干扰头在写间隙处产生写信号的能力。 头部保留从空气轴承表面去除磁阻元件的优点，以避免磨损，短路和腐蚀，并消除与双间隙磁阻头相关的交叉磁道不对称性; 以及与硅平面头部结构相关的低成本制造和高面积密度的优点。
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公开(公告)号：US5073836A
公开(公告)日：1991-12-17
申请号：US417374
申请日：1989-10-05
CPC分类号： G11B5/3967 , G11B5/1278
摘要： A head structure for reading and writing perpendicular transitions from and to a moving recording medium. The head structure comprises an auxiliary magnetic pole having a tapered edge adjacent its air bearing surface that is oriented transverse to the direction of motion of a recording medium. A magnetoresistive gradiometer employed as the read mechanism is formed within a layer of insulating material disposed on the auxiliary pole member. The gradiometer comprises two magnetoresistive members separated by dielectric material, and two shield members disposed on opposite sides of the magnetoresistive members. The shield members shield the magnetoresistive members from undesired magnetic fields and thus improve the resolution of the signals read from the medium. A coil is formed on and encapsulated within a layer of photoresist material deposited above the layer of insulating material. A primary magnetic pole is disposed on the layer of photoresist material and has a portion thereof which tapers toward the air bearing surface. The primary and auxiliary magnetic poles are adapted to write to the recording medium. A portion of the primary magnetic pole is spaced away from the auxiliary pole member at a location substantially opposite the location of the gradiometer, in order to minimize data erasure in the recording medium by increasing the reluctance of the head strcuture. This gap minimizes data erasure in the recording medium due to stray magnetic fields by enhancing the reluctance of the head structure. A layer of nonmagnetic insulating material is disposed on the primary magnetic pole to encapsulate it and complete the head structure. The geometry of the head structure minimizes its sensitivity to externally applied fields. The magnetoresistive gradiometer is positioned in the gap of the write head so that it experiences minimum fields caused by write coil excitation. Furthermore, the geometry of the gradiometer head shields results in better linear resolution than conventional head designs without shields.
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公开(公告)号：US5834864A
公开(公告)日：1998-11-10
申请号：US527479
申请日：1995-09-13
IPC分类号： G01B7/00 , B81B3/00 , B81C1/00 , G01B7/34 , G02B21/32 , G02B26/08 , G11B5/596 , G11B9/00 , G11B19/20 , G11B21/00 , G11B21/02 , G11B21/08 , G12B5/00 , H02K11/00 , H02K33/18 , H02K41/03 , H02K41/035 , H02N11/00
CPC分类号： G01Q10/04 , B82Y35/00 , G02B21/32 , G02B26/085 , G11B19/20 , G11B21/00 , G11B21/02 , G11B21/08 , H02K33/18 , H02K99/00 , B82Y10/00 , G11B9/1418 , G11B9/1436 , H02K11/00 , H02K2201/18 , H02K41/035
摘要： A specially designed, forceful, compact magnetic micro-mover includes at least one etched single crystal silicon plate having integral springs and stable, low internal stress. A structure of springs which support a rectangular plate are etched in silicon. The plate is driven by planar electromagnetic actuation. The micro-mover consists of a specific etched silicon spring in combination with a planar electromagnetic moving coil actuator that is capable of generating forces greater than 50 mN, while dissipating less than 1 W peak power. The micro-mover also includes a plate suspension system that facilitates the required plate motions and resolution, while preventing changes in plate spacing from effects such as external acceleration, temperature, humidity, and aging; and includes an actuator that appropriately moves the plates in response to electrical signals, such that there is only minimal cross-talk between axes of motion.
摘要翻译： 一个特别设计，强大的紧凑型磁性微动机包括至少一个具有整体弹簧和稳定的低内应力的蚀刻单晶硅板。 在硅中蚀刻支撑矩形板的弹簧结构。 板由平面电磁驱动驱动。 微型移动器由特定的蚀刻硅弹簧与平面电磁运动线圈致动器组合，其能够产生大于50mN的力，同时耗散小于1W的峰值功率。 微型移动器还包括板悬挂系统，其有助于所需的板运动和分辨率，同时防止板间距从外部加速度，温度，湿度和老化等影响的变化; 并且包括响应于电信号适当地移动板的致动器，使得在运动轴之间仅存在最小的串扰。
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公开(公告)号：US5491606A
公开(公告)日：1996-02-13
申请号：US410382
申请日：1995-03-27
CPC分类号： G11B5/3903 , G11B5/3183 , G11B5/3925
摘要： Providing a magnetic head with a yoke and a gap structure coupled to a substrate that is positioned above a magnetic medium. The gap structure includes one or more lips, a first and a second ferromagnetic pole, and a magnetoresistive element (MRE). The magnetoresistive element is removed from the air-bearing surface of the magnetic head. For the embodiment with two lips, the two lips define a head gap. Each ferromagnetic pole is connected to one lip. The two poles are separated by a distance greater than the length of the gap, and each pole has a thickness that is greater than the thickness of each lip. The MRE is substantially coupled magnetically, but not electrically to the two poles at a location where the two poles are separated by a distance greater than the length of the gap.
摘要翻译： 提供具有轭的磁头和耦合到位于磁介质上方的衬底的间隙结构。 间隙结构包括一个或多个唇缘，第一和第二铁磁极以及磁阻元件（MRE）。 磁阻元件从磁头的空气轴承表面去除。 对于具有两个嘴唇的实施例，两个唇缘限定头部间隙。 每个铁磁极连接到一个唇缘。 两个极分开大于间隙长度的距离，每个极的厚度大于每个唇的厚度。 在两极被间隔大于间隙长度的位置处，MRE基本上磁耦合耦合，但不与两极电连接。
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公开(公告)号：US5309304A
公开(公告)日：1994-05-03
申请号：US894394
申请日：1992-06-05
申请人： Steven L. Naberhuis , Ralph Simmons , Robert J. Davidson , Victor W. Hesterman , Lung T. Tran , Giora J. Tarnopolsky
发明人： Steven L. Naberhuis , Ralph Simmons , Robert J. Davidson , Victor W. Hesterman , Lung T. Tran , Giora J. Tarnopolsky
CPC分类号： G11B5/3954 , G11B5/399
摘要： In a magnetoresistive transducer, a conductor configuration in which magnetic fields in the conductors are oriented in the same direction to provide symmetric track profiles and improved track edge response. Conductor area at the transducer air bearing surface is also minimized to eliminate shorting and improve device yield and reliability. In one embodiment of the invention, inductive pickup is minimized by limiting the active width of magnetoresistive sensing elements through conductor placement. Another embodiment of the invention, useful for applications involving dual stripe magnetoresistive transducers, minimizes inductive pickup by providing relatively large conductors for each magnetoresistive stripe, arranged in parallel with each other and coupled differentially to cancel inductive pickup through common mode rejection.
摘要翻译： 在磁阻换能器中，导体配置中导体中的磁场被定向在相同的方向上以提供对称的轨道轮廓和改进的轨道边缘响应。 传感器空气轴承表面的导体面积也被最小化，以消除短路并提高器件的产量和可靠性。 在本发明的一个实施例中，通过通过导线放置来限制磁阻感测元件的有源宽度来使电感拾取器最小化。 可用于涉及双条磁阻传感器的应用的本发明的另一个实施例通过为每个磁阻条提供相对较大的导体使彼此并联布置并且通过共模抑制来抵消电感拾取器而被耦合地极化电感拾取。
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10.发明授权
公开(公告)号：US4987509A
公开(公告)日：1991-01-22
申请号：US417351
申请日：1989-10-05
CPC分类号： G11B5/3954 , G11B5/1278 , G11B5/3903
摘要： A magnetoresistive head structure that incorporates a thin film magnetoresistive transducer that is suitable for use in perpendicular and longitudinal recording heads. This structure includes first and second dielectrically separated magnetoresistive members that have noncontacting first ends. Sense conductors are disposed in contact with the first ends of the magnetoresistive members and are adapted to provide sense currents thereto. A bias current conductor arrangement is disposed adjacent to the magnetoresistive members and is separated therefrom by dielectric and is adapted to provide bias current thereto. A common conductor is disposed in contact with the second ends of the magnetoresistive members and is adapted to short the second ends thereof and provide a return path for the sense and bias currents. In one embodiment, the bias conductor arrangement passes between the magnetoresistive members and thus provides for longitudinal transition detection. In another embodiment, the bias conductor arrangement passes adjacent one side of the first magnetoresistive member and returns on the other side of the two magnetoresistive elements and thus provides for perpendicular transition detection. Additionally, a plurality of nonmagnetic shield members may be provided adjacent the magnetoresistive members to magnetically shield them from extraneous magnetic fields and improve resolution. Differential amplification means may also be provided for processing voltages sensed across the magnetoresistive members.
摘要翻译： 磁阻头结构，其结合了适用于垂直和纵向记录头的薄膜磁阻换能器。 该结构包括具有非接触式第一端的第一和第二介电分离的磁阻构件。 感应导体设置成与磁阻构件的第一端接触，并且适于向其提供感测电流。 偏置电流导体布置被布置成与磁阻部件相邻并且通过电介质分离，并且适于向其提供偏置电流。 公共导体设置成与磁阻构件的第二端接触，并且适于使其第二端短路，并提供用于感测和偏置电流的返回路径。 在一个实施例中，偏置导体布置在磁阻构件之间通过，从而提供纵向过渡检测。 在另一个实施例中，偏置导体布置通过第一磁阻部件的相邻一侧并返回到两个磁阻元件的另一侧，从而提供垂直转变检测。 此外，可以在磁阻构件附近设置多个非磁性屏蔽构件，以将它们磁阻地从外部磁场屏蔽，并提高分辨率。 还可以提供差分放大装置来处理跨磁阻构件感测的电压。
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