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131 条记录 (耗时 0.029 秒)

    Apparatus and method for measurement of magnetic remanence-thickness product of thin magnetic layers
    3.
    发明授权
    Apparatus and method for measurement of magnetic remanence-thickness product of thin magnetic layers 失效
    用于测量薄磁层的磁残余厚度乘积的装置和方法

    公开(公告)号：US5629620A

    公开(公告)日：1997-05-13

    申请号：US398197

    申请日：1995-03-02

    申请人： Frederick J. Jeffers ,  Neil Smith

    发明人： Frederick J. Jeffers ,  Neil Smith

    IPC分类号： G01N27/72 ,  G01R33/09 ,  G01R33/12 ,  G01N27/76

    CPC分类号： G01R33/1207 ,  G01N27/72 ,  G01R33/09

    摘要： In the simplest embodiment of the invention, the apparatus holds the edge of the magnetized film to be measured close to, and above, a linearly biased magnetoresistive (MR) element. Magnetic poles appearing at the magnetic discontinuity at the edge of the film generate a magnetic field which is incident on the MR element, and which results in a measurable change in the element's resistivity. In a preferred embodiment, a pair of MR elements are placed so that they are both linearly biased by a magnet; only one of the MR elements being in close proximity to, and influenced by the magnetic field emanating from the edge of the magnetized film. The second MR element, selected for matched characteristics with the first MR element, is located out of the field of the magnetized film, but still subject to the same temperature environment and field noise as the first MR element. The two MR elements are configured with associated resistors as arms of a Wheatstone bridge so that the common mode fields and thermal drift signals experienced by both MR elements are canceled to the first order, and the output of the bridge is proportional to the change in resistance in the first MR element due only to the field of the magnetized film.

    摘要翻译： 在本发明的最简单的实施例中，该装置将被测量的被测磁片的边缘保持在线性偏置的磁阻（MR）元件上方和之上。 出现在膜边缘处的磁性不连续处的磁极产生入射在MR元件上的磁场，并导致元件电阻率的可测量的变化。 在优选实施例中，一对MR元件被放置成使得它们都被磁体线性偏置; 只有一个MR元件紧邻并受到从磁化膜的边缘发出的磁场的影响。 被选择用于与第一MR元件的匹配特性的第二MR元件位于磁化膜的场外，但仍然受到与第一MR元件相同的温度环境和场噪声的影响。 两个MR元件配置有相关联的电阻器作为惠斯通电桥的臂，使得由两个MR元件经受的共模场和热漂移信号被抵消到一阶，并且桥的输出与电阻的变化成比例 在第一MR元件中仅由于磁化膜的场。

    Laminated magnetic record/playback head with thin films of high permeability material spaced apart by very thin films of insulating magnetic material for high bit densities and data transfer rates
    4.
    发明授权
    Laminated magnetic record/playback head with thin films of high permeability material spaced apart by very thin films of insulating magnetic material for high bit densities and data transfer rates 失效
    具有高渗透性材料的薄膜的层压磁记录/回放头通过非常薄的绝缘磁性材料薄膜，用于高双面密度和数据传输速率

    公开(公告)号：US5239435A

    公开(公告)日：1993-08-24

    申请号：US674011

    申请日：1991-03-25

    申请人： Frederick J. Jeffers ,  Neil Smith

    发明人： Frederick J. Jeffers ,  Neil Smith

    IPC分类号： G11B5/187 ,  G11B5/21 ,  G11B5/31

    CPC分类号： G11B5/1872 ,  G11B5/21 ,  G11B5/3143

    摘要： A thin film magnetic record/playback head having suitably thin layers of soft, high permeability magnetic material, such as permalloy, electrically insulated from each other by very thin layers of a magnetic material having suitably high resistivity, such as NiZn ferrite. The improved magnetic record/playback head is capable of reading and writing much higher bit densities (up to about 100 kfci) and at much higher frequencies (100 MHz or higher) than prior art devices while remaining fully compatible with existing electronic circuitry.

    摘要翻译： 薄膜磁记录/重放头具有适当薄层的柔软，高磁导率磁性材料，例如坡莫合金，通过非常薄的具有适当高电阻率的磁性材料的诸如NiZn铁氧体彼此绝缘。 改进的磁记录/重放头能够读取和写入比现有技术的设备高得多的比特密度（高达约100kfci）和高得多的频率（100MHz或更高），同时与现有的电子电路保持完全兼容。

    High-sensitivity magnetorresistive magnetometer having laminated flux collectors defining an open-loop flux-conducting path
    5.
    发明授权
    High-sensitivity magnetorresistive magnetometer having laminated flux collectors defining an open-loop flux-conducting path 失效
    具有限定开环导通路径的层叠磁通收集器的高灵敏度磁阻磁力计

    公开(公告)号：US5119025A

    公开(公告)日：1992-06-02

    申请号：US737755

    申请日：1991-07-30

    申请人： Neil Smith ,  Frederick J. Jeffers

    发明人： Neil Smith ,  Frederick J. Jeffers

    IPC分类号： G01R33/09

    CPC分类号： G01R33/09

    摘要： A magnetometer includes a magnetoresistive element and first and second high-permeable laminated flux collectors of height H partially overlapping, respectively, opposing lateral edges of the magnetoresistive element, wherein the flux collectors are separated laterally by a gap of length G which the magnetoresistive element spans. The two laminated flux collector and the magnetoresistive element cooperatively form an open-loop flux-conducting path of total height 2H+G, that is capable of collecting flux of a magnetic field being measured and, in response to the flux collected, developing a magnetometive force across the gap G that is functionally related to the height of the flux collectors.

    摘要翻译： 磁力计包括磁阻元件和分别与磁阻元件相对的横向边缘部分重叠的高度为H的第一和第二高透过率层叠磁通收集器，其中磁通收集器横向分开长度G的间隙，磁阻元件跨越 。 两个层叠的磁通收集器和磁阻元件协同地形成总高度为2H + G的开环磁通传导路径，其能够收集被测量的磁场的磁通量，并且响应于所收集的磁通量而形成磁力计 功能上与通量收集器的高度相关的间隙G的力。

    Magnetically capped dual magnetoresistive reproduce head
    8.
    发明授权
    Magnetically capped dual magnetoresistive reproduce head 失效
    磁阻双磁阻复制头

    公开(公告)号：US5644456A

    公开(公告)日：1997-07-01

    申请号：US583578

    申请日：1996-01-05

    申请人： Neil Smith ,  Jay D. Freeman

    发明人： Neil Smith ,  Jay D. Freeman

    IPC分类号： G11B5/39 ,  G11B5/147

    CPC分类号： G11B5/3938 ,  G11B5/3948 ,  G11B5/3954 ,  G11B5/3987

    摘要： A magnetically permeable "cap" is deposited across the top face (the bottom face being the face at the head-medium interface), or on the end faces, or on both the top and the end faces of a DMR reproduce head. The top cap serves as a magnetic keeper which provides flux closure between the two MR elements of the DMR when they are transversely magnetized anti-parallel to each other. By means of a magnetic cap of only moderate effective permeability, the current density required to optimally bias a DMR head is reduced by a factor of from 3 to 4. The presence of the top cap layer also provides an increase in the intrinsic sensitivity (independent of the bias level) of the DMR by a factor of 2. Further, when the head is fully biased to also include longitudinal biasing of the MR elements, the caps at the longitudinal ends of the MR stripes magnetically stabilize the fully antisymmetric bias configuration providing optimal performance for a DMR head. The end caps also provide for establishing the necessary electrical conductive path between the two MR elements of the DMR. In an additional embodiment, an electrically insulating layer between the magnetically permeable layer and the MR elements breaks any exchange coupling between the magnetically permeable layer and the MR elements.

    摘要翻译： 磁性可渗透的“帽”沉积在DMR再现头的顶面（底面是头部 - 介质界面处的面），或端面上，或两者的顶面和端面上。 顶盖用作磁力保持器，当它们被横向磁化成彼此反平行时，其在DMR的两个MR元件之间提供磁通闭合。 通过仅具有中等有效磁导率的磁性盖，将DMR磁头最佳偏置所需的电流密度降低3至4倍。顶盖层的存在还提供了内在灵敏度的增加（独立 的偏置电平）。此外，当磁头被完全偏置并且还包括MR元件的纵向偏置时，MR条纹的纵向端部处的盖板磁性地稳定完全反对称的偏置构造，从而提供 DMR头的最佳性能。 端盖还提供在DMR的两个MR元件之间建立必要的导电路径。 在另外的实施例中，导磁层和MR元件之间的电绝缘层破坏了导磁层和MR元件之间的任何交换耦合。

    Multi-Dimensional Layered Pulse Motor
    9.
    发明申请
    Multi-Dimensional Layered Pulse Motor 审中-公开

    公开(公告)号：US20190036433A1

    公开(公告)日：2019-01-31

    申请号：US16071912

    申请日：2017-02-18

    申请人： Neil Smith

    发明人： Neil Smith

    IPC分类号： H02K21/24 ,  H02K7/00 ,  H02K7/08 ,  H02P3/10 ,  H02P3/14 ,  B60L7/10 ,  B60K7/00

    摘要： A pulse hub motor having coils (101) and magnets (107) interacting three dimensionally in x, y, and z axes to facilitate both increased power and efficiency through the ability to have more coils (101) in the motor, have each coil (101) perform both push and pull functions, and yet have the flexibility to only use the amount of coils (101) needed for real-time power requirements, whilst regenerating power in both normal drive and braking modes.

    IMPLEMENTING SPIN-TORQUE OSCILLATOR SENSING WITH ENHANCED INTEGRATED DEMODULATOR FOR HARD DISK DRIVES
    10.
    发明申请
    IMPLEMENTING SPIN-TORQUE OSCILLATOR SENSING WITH ENHANCED INTEGRATED DEMODULATOR FOR HARD DISK DRIVES 有权
    用于硬盘驱动器的增强型集成式解调器实现旋转振动振荡器感应

    公开(公告)号：US20130148224A1

    公开(公告)日：2013-06-13

    申请号：US13316419

    申请日：2011-12-09

    申请人： Patrick Mesquita Braganca ,  Richard Leo Galbraith ,  Bruce Alvin Gurney ,  Neil Smith ,  Bruce Wilson ,  Rehan Ahmed Zakai

    发明人： Patrick Mesquita Braganca ,  Richard Leo Galbraith ,  Bruce Alvin Gurney ,  Neil Smith ,  Bruce Wilson ,  Rehan Ahmed Zakai

    IPC分类号： G11B20/06

    CPC分类号： H03D3/009 ,  G11B20/10018 ,  G11B20/10027 ,  G11B2220/2516

    摘要： A method, apparatus, and system are provided for implementing spin-torque oscillator sensing with an enhanced integrated demodulator for hard disk drives. The demodulator receives an input signal from a STO read sensor having an oscillation frequency ω related to the strength of the detected magnetic signal field. The demodulator includes a pair of mixers coupled to a quadrature reference oscillator with respective quadrature components cos(ω0t), and sin(ω0t) of the quadrature reference oscillator being mixed with a received input signal to form signals at the sum and difference frequencies, ω±ω0. Each of these mixer products is lowpass filtered by a respective a lowpass filter to remove the sum frequency components for providing a demodulator output signal that is directly proportional the STO oscillation frequency ω. The demodulator output signal is used for processing by data detection electronics.

    摘要翻译： 提供了一种用于通过用于硬盘驱动器的增强型集成解调器来实现自旋扭矩振荡器感测的方法，装置和系统。 解调器接收来自具有与所检测的磁信号场的强度相关的振荡频率ω的STO读取传感器的输入信号。 解调器包括耦合到具有相应正交分量cos（ωωt）的正交参考振荡器的正交参考振荡器对，并且正交基准振荡器的sin（ω0t）与接收的输入信号混合以形成和频率和差频率ω ±omega0。 这些混频器产品中的每一个由相应的低通滤波器进行低通滤波，以去除和频分量，以提供与STO振荡频率ω直接成比例的解调器输出信号。 解调器输出信号用于数据检测电子设备的处理。