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    Stability-enhancing underlayer for exchange-coupled magnetic structures, magnetoresistive sensors, and magnetic disk drive systems
    1.
    发明授权
    Stability-enhancing underlayer for exchange-coupled magnetic structures, magnetoresistive sensors, and magnetic disk drive systems 有权
    用于交换耦合磁性结构的稳定性增强型底层，磁阻传感器和磁盘驱动系统

    公开(公告)号：US06836392B2

    公开(公告)日：2004-12-28

    申请号：US09841942

    申请日：2001-04-24

    申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

    发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

    IPC分类号： G11B539

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  H01F10/3277

    摘要： An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.

    摘要翻译： 交换耦合磁性结构包括强磁性层，用于偏置铁磁性层的磁化的钴铁氧体的矫顽铁氧体层以及邻近矫顽铁氧体层的氧化钴底层，例如氧化钴。 氧化物底层具有岩盐或尖晶石的晶格结构，并且在室温下不显示磁矩。 底层影响矫顽铁氧体层的结构，因此影响其磁特性，提供增强的矫顽力和增强的热稳定性。 结果，矫顽铁氧体层的热稳定性比没有底层要小得多的厚度。 交换耦合结构用于磁盘驱动系统读磁头中的自旋阀和磁隧道结磁阻传感器。 由于矫顽铁氧体层可以制成1nm的薄而保持热稳定性，所以传感器满足高记录密度系统的窄间隙要求。

    Exchange-coupled magnetoresistive sensor with a coercive ferrite layer and an oxide underlayer having a spinal lattice structure
    2.
    发明授权
    Exchange-coupled magnetoresistive sensor with a coercive ferrite layer and an oxide underlayer having a spinal lattice structure 失效
    具有矫顽铁氧体层和具有脊椎晶格结构的氧化物底层的交换耦合磁阻传感器

    公开(公告)号：US06992866B2

    公开(公告)日：2006-01-31

    申请号：US10931315

    申请日：2004-08-31

    申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

    发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Thai Le ,  Stefan Maat ,  Philip Milton Rice

    IPC分类号： G11B5/39

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  H01F10/3277

    摘要： An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.

    摘要翻译： 交换耦合磁性结构包括强磁性层，用于偏置铁磁性层的磁化的钴铁氧体的矫顽铁氧体层以及邻近矫顽铁氧体层的氧化钴底层，例如氧化钴。 氧化物底层具有岩盐或尖晶石的晶格结构，并且在室温下不显示磁矩。 底层影响矫顽铁氧体层的结构，因此影响其磁特性，提供增强的矫顽力和增强的热稳定性。 结果，矫顽铁氧体层的热稳定性比没有底层要小得多的厚度。 交换耦合结构用于磁盘驱动系统读磁头中的自旋阀和磁隧道结磁阻传感器。 由于矫顽铁氧体层可以制成1nm的薄而保持热稳定性，所以传感器满足高记录密度系统的窄间隙要求。

    Magnetic recording media with antiferromagnetically coupled ferromagnetic films as the recording layer
    4.
    发明授权
    Magnetic recording media with antiferromagnetically coupled ferromagnetic films as the recording layer 有权
    具有反铁磁耦合铁磁膜的磁记录介质作为记录层

    公开(公告)号：US06280813B1

    公开(公告)日：2001-08-28

    申请号：US09416364

    申请日：1999-10-08

    申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

    发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

    IPC分类号： B32B302

    CPC分类号： C23C28/021 ,  C23C28/00 ,  C23C28/023 ,  C23C28/42 ,  G11B5/66

    摘要： A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film. The magnetic moments of the two antiferromagnetically-coupled films are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of the recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in the thermal stability of the recording medium because the volumes of the grains in the antiferromagnetically-coupled films add constructively. In a magnetic recording rigid disk application, the magnetic layer comprises two ferromagnetic films, each a granular film of a sputter deposited CoPtCrB alloy, separated by a Ru spacer film having a thickness to maximize the antiferromagnetic exchange coupling between the two CoPtCrB films. One of the ferromagnetic films is made thicker than the other, but the thicknesses are chosen so that the net moment in zero applied magnetic field is low, but nonzero.

    摘要翻译： 用于数据存储的磁记录介质使用具有至少两个铁磁膜的磁记录层，其通过非铁磁间隔膜反铁磁耦合在一起。 两个反铁磁耦​​合薄膜的磁矩定向反平行，因此记录层的净残磁强度 - 厚度积（Mrt）是两个铁磁膜的Mrt值之差。 由于反铁磁耦合膜中的晶粒的体积增加，所以Mrt的这种减少是在记录介质的热稳定性降低的情况下完成的。 在磁记录刚性盘应用中，磁性层包括两个铁磁膜，每个是由溅射沉积的CoPtCrB合金的粒状膜，由具有厚度的Ru隔离膜隔开，以使两个CoPtCrB膜之间的反铁磁交换耦合最大化。 其中一个铁磁膜比另一个更厚，但是选择厚度使得零施加磁场的净力矩低，但非零。

    Method for recording magnetic transitions on recording layer having antiferromagnetically coupled ferromagnetic films
    5.
    发明授权
    Method for recording magnetic transitions on recording layer having antiferromagnetically coupled ferromagnetic films 失效
    在具有反铁磁耦合铁磁膜的记录层上记录磁转变的方法

    公开(公告)号：US06594100B2

    公开(公告)日：2003-07-15

    申请号：US09903959

    申请日：2001-07-11

    申请人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

    发明人： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

    IPC分类号： G11B503

    CPC分类号： C23C28/021 ,  C23C28/00 ,  C23C28/023 ,  C23C28/42 ,  G11B5/66

    摘要： A method for writing data on a magnetic recording medium includes providing a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film, with one of the ferromagnetic films having a greater magnetic moment than the other. A positive write field is applied to a first region to align the moments of both ferromagnetic films with the positive field, and then a negative write field is applied to an adjacent region to align the moments of both ferromagnetic films with the negative field. When the medium is moved away from the write fields, the moment of the ferromagnetic film with the lesser moment in each region flips to be antiparallel to the moment of the other ferromagnetic film in its region. The result is that the adjacent regions become adjacent magnetized domains with the transition between the domains representative of the written data.

    摘要翻译： 一种在磁记录介质上写入数据的方法包括提供具有至少两个铁磁膜的磁记录层，所述至少两个铁磁膜在非铁磁隔离膜上反铁磁耦合在一起，其中一个铁磁膜具有比另一个更大的磁矩。 将正写入场施加到第一区域以将两个铁磁膜的力矩与正场对准，然后将负写入场施加到相邻区域以将两个铁磁膜的力矩与负场对准。 当介质从写入场移动时，每个区域中具有较小力矩的铁磁膜的力矩翻转成与其区域中的另一个铁磁膜的时刻反平行。 结果是相邻区域变成相邻的磁化域，其中代表写入数据的域之间的转变。