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46 条记录 (耗时 0.031 秒)

    Apparatus and method for measurement of magnetic remanence-thickness product of thin magnetic layers
    5.
    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
    6.
    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
    7.
    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。

    Tracking control apparatus including a servo head having a tapered transducing gap
    8.
    发明授权
    Tracking control apparatus including a servo head having a tapered transducing gap 失效
    跟踪控制装置包括具有锥形换能间隙的伺服头

    公开(公告)号：US5398145A

    公开(公告)日：1995-03-14

    申请号：US238599

    申请日：1994-05-05

    申请人： Frederick J. Jeffers ,  John Rolker

    发明人： Frederick J. Jeffers ,  John Rolker

    IPC分类号： G11B5/23 ,  G11B5/29 ,  G11B5/584 ,  G11B5/596

    CPC分类号： G11B5/596 ,  G11B5/584 ,  G11B5/23 ,  G11B5/29

    摘要： Tracking control apparatus includes a magnetic recording medium (disk or tape) comprising a dedicated servo track having recorded thereon a servo signal having a fixed spatial wavelength, and magnetic playback apparatus comprising a servo tracking head having an elongated tapered transducing gap transverse to the dedicated servo track. The transducing gap has (1) a relatively small magnetic gap length, at a first end of the gap, which is less than the spatial wavelength of the recorded signal, and (2) a relatively large magnetic gap length, at a second opposing end of the gap, which is greater than the spatial wavelength of the recorded servo signal. The servo head is in a desired tracking position when the segment of the tapered gap aligned with the servo track has a magnetic gap length that is equal to the spatial wavelength of the servo signal.

    摘要翻译： 跟踪控制装置包括磁记录介质（磁盘或磁带），其包括其上记录有具有固定空间波长的伺服信号的专用伺服磁道，以及包括伺服跟踪头的磁性重放装置，该伺服跟踪头具有横向于专用伺服的细长锥形换能间隙 跟踪。 换能间隙具有（1）在间隙的第一端处小于记录信号的空间波长的相对较小的磁隙长度，和（2）相对较大的磁隙长度，在第二相对端 的间隙，其大于记录的伺服信号的空间波长。 当与伺服轨道对准的锥形间隙的段具有等于伺服信号的空间波长的磁隙长度时，伺服头处于期望的跟踪位置。

    Ferrite film insulating layer in a yoke-type magneto-resistive head
    9.
    发明授权
    Ferrite film insulating layer in a yoke-type magneto-resistive head 失效
    磁轭型磁阻头中的铁氧体膜绝缘层

    公开(公告)号：US4754354A

    公开(公告)日：1988-06-28

    申请号：US859685

    申请日：1986-05-05

    申请人： Frederick J. Jeffers

    发明人： Frederick J. Jeffers

    IPC分类号： G11B5/39 ,  G11B5/235

    CPC分类号： G11B5/3925

    摘要： A yoke-type magneto-resistive head employs a thin magnetic film structure to bridge a gap in the flux conducting structure of the head and thereby sense magnetic flux. The invention provided means for reducing the magnetic reluctance of the interface between the magnetic film structures and the flux conducting structure of the head, to improve the coupling of magnetic flux from the flux conducting structure to the magnetic film structure and thereby increase the sensitivity of the magneto-resistive head.

    摘要翻译： 轭型磁阻头采用薄磁膜结构来桥接磁头的磁通传导结构中的间隙，从而感测磁通量。 本发明提供了减小磁性膜结构与磁头导磁结构之间的界面的磁阻的装置，以改善磁通从磁通传导结构到磁膜结构的耦合，从而提高 磁阻头。

    Magneto-resistive head with reduced thermal noise
    10.
    发明授权
    Magneto-resistive head with reduced thermal noise 失效
    具有降低热噪声的磁阻头

    公开(公告)号：US4683508A

    公开(公告)日：1987-07-28

    申请号：US693957

    申请日：1985-01-23

    申请人： Frederick J. Jeffers ,  John L. Simonds

    发明人： Frederick J. Jeffers ,  John L. Simonds

    IPC分类号： G11B5/39 ,  G11B5/127 ,  G11B5/33

    CPC分类号： G11B5/3903

    摘要： To lessen thermal noise in a magneto-resistive head employing a slotted magneto-resistive sensing element, the present invention provides for such element to be plated with a highly thermally conductive film (e.g. gold, silver, copper, aluminum, etc.) exclusively in the slotted portion of the element. By restricting such plating to the slotted portion of the sensing element, the film thereon will be precluded from electrically short circuiting the magneto-resistive sensing element . . . while, at the same time, serving as an energy-spreading heat sink.

    摘要翻译： 为了减少采用开槽磁阻感测元件的磁阻头中的热噪声，本发明提供了这样一种元件，其中仅仅镀有高导热膜（例如金，银，铜，铝等） 元件的开槽部分。 通过将这种电镀限制在感测元件的开槽部分，其上的膜将被阻止使电磁感测元件电短路。 。 。 同时，作为能量散布散热器。