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    Shield structure design to improve the stability of an MR head
    5.
    发明授权
    Shield structure design to improve the stability of an MR head 有权
    盾构结构设计提高MR头的稳定性

    公开(公告)号：US07180712B1

    公开(公告)日：2007-02-20

    申请号：US09513873

    申请日：2000-02-28

    申请人： Min Li ,  Simon H. Liao ,  Cheng T. Horng ,  Kochan Ju

    发明人： Min Li ,  Simon H. Liao ,  Cheng T. Horng ,  Kochan Ju

    IPC分类号： G11B5/127 ,  G11B5/33

    CPC分类号： G11B5/112 ,  G11B5/3912 ,  H01L43/08

    摘要： A method for forming a laminated shield to improve the stability and performance of an MR read head and the MR read head formed using that shield. The shield consists of two layers of ferromagnetic material separated by a layer of ruthenium, allowing the ferromagnetic layers to form an antiferromagnetic configuration by means of a quantum mechanical exchange interaction. The antiferromagnetic configuration has a stable domain structure and a magnetization that forms closed loops around the shield edges thereby reducing noise in the readback signal and reducing disturbances to the magnetic state of the sensor element.

    摘要翻译： 一种用于形成层叠屏蔽以提高使用该屏蔽形成的MR读取头和MR读取头的稳定性和性能的方法。 屏蔽由两层铁磁材料组成，由一层钌分离，允许铁磁层通过量子力学交换相互作用形成反铁磁性结构。 反铁磁构造具有稳定的畴结构和磁化，其在屏蔽边缘周围形成闭环，从而降低回读信号中的噪声并减少对传感器元件的磁状态的干扰。

    Synthetic anti-parallel spin valve, having improved robustness, and process to manufacture it
    6.
    发明授权
    Synthetic anti-parallel spin valve, having improved robustness, and process to manufacture it 有权
    合成的反并联自旋阀，具有改进的鲁棒性，以及制造方法

    公开(公告)号：US06620530B1

    公开(公告)日：2003-09-16

    申请号：US09769813

    申请日：2001-01-26

    申请人： Min Li ,  Cheng T. Horng ,  Ru Ying Tong ,  Simon H. Liao ,  Kochan Ju

    发明人： Min Li ,  Cheng T. Horng ,  Ru Ying Tong ,  Simon H. Liao ,  Kochan Ju

    IPC分类号： G11B560

    CPC分类号： B82Y25/00 ,  B82Y40/00 ,  G11B5/3163 ,  H01F10/3268 ,  H01F10/3295 ,  H01F41/302 ,  Y10S428/90 ,  Y10T428/11 ,  Y10T428/1121

    摘要： A spin valve structure and a method for manufacturing it are described. The spin valve uses a modified pinned layer that consists of two cobalt iron layers separated by a layer of either ruthenium, iridium, or rhodium. A key feature of the invention is that this spacer layer is significantly thinner (typically 3-4 Angstroms) than similar layers in prior art structures. Normally, when such thin spacer layers are used, annealing fields in excess of 20,000 Oersted are needed to cause the two cobalt iron layers to become antiparallel. The present invention, however, teaches that much lower annealing fields (spanning a limited range) may be used with equal effect. The result is that a very high internal pinning field is created giving devices of this type greater pinned layer stability and reduced pinning reversal. These devices also exhibits a minimum amount of open looping in their hysteresis curves.

    摘要翻译： 描述了一种自旋阀结构及其制造方法。 自旋阀使用由两层钴铁层组成的改性钉扎层，其由钌，铱或铑层分开。 本发明的一个关键特征是该间隔层比现有技术结构中相似的层明显更薄（通常为3-4埃）。 通常，当使用这种薄的间隔层时，需要超过20,000奥斯特的退火场，以使两个钴铁层变得反平行。 然而，本发明教导了可以使用相同效果的低得多的退火场（跨越有限范围）。 结果是产生非常高的内部钉扎场，使得这种类型的装置更大的被钉扎层稳定性并减少钉扎反转。 这些装置在其滞后曲线中也表现出最小量的开环。

    Ruthenium bias compensation layer for spin valve head and process of manufacturing
    7.
    发明授权
    Ruthenium bias compensation layer for spin valve head and process of manufacturing 失效
    用于自旋阀头的钌偏置补偿层和制造过程

    公开(公告)号：US06396671B1

    公开(公告)日：2002-05-28

    申请号：US09525670

    申请日：2000-03-15

    申请人： Cheng T. Horng ,  Mao-Min Chen ,  Kochan Ju ,  Min Li ,  Simon H. Liao ,  Ku-Ying Tong

    发明人： Cheng T. Horng ,  Mao-Min Chen ,  Kochan Ju ,  Min Li ,  Simon H. Liao ,  Ku-Ying Tong

    IPC分类号： G11B539

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3143 ,  G11B5/3903 ,  H01F10/3268 ,  H01F10/3295 ,  H01F41/325 ,  Y10T29/49044

    摘要： A spin valve structure, and method for manufacturing it, are described. The valve is subject to only small bias point shifts by sense current fields while at the same time has good GMR characteristics. This is achieved by introducing a layer of about 15 Angstroms of ruthenium between the seed layer and the free layer. This acts as an effective bias control layer with the added benefit of providing interfaces (to both the seed and the free layer) that are highly favorable to specular reflection of the conduction electrons. The HCP crystal structure of this ruthenium layer also improves the crystalline quality of the free layer thereby improving its performance with respect to the GMR ratio.

    摘要翻译： 自旋阀结构及其制造方法。 阀门只能通过感应电流场进行小的偏移点偏移，同时具有良好的GMR特性。 这通过在种子层和自由层之间引入约15埃的钌层来实现。 这充当有效的偏置控制层，具有提供对传导电子的镜面反射非常有利的界面（对种子和自由层）的附加益处。 该钌层的HCP晶体结构也改善了自由层的结晶质量，从而提高了其相对于GMR比的性能。

    Spin valve structure design with laminated free layer
    8.
    发明授权
    Spin valve structure design with laminated free layer 失效
    自旋阀结构设计采用层压自由层

    公开(公告)号：US06392853B1

    公开(公告)日：2002-05-21

    申请号：US09489973

    申请日：2000-01-24

    申请人： Min Li ,  Simon H. Liao ,  Cheng T. Horng ,  Youfeng Zheng ,  Ru-Ying Tong ,  Kochan Ju

    发明人： Min Li ,  Simon H. Liao ,  Cheng T. Horng ,  Youfeng Zheng ,  Ru-Ying Tong ,  Kochan Ju

    IPC分类号： G11B539

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G01R33/096 ,  G11B5/3967 ,  G11B2005/3996 ,  H01F10/324 ,  H01F10/3268 ,  H01F10/3295 ,  H01L43/08 ,  Y10T428/1121 ,  Y10T428/12465 ,  Y10T428/26

    摘要： The giant magnetoresistance (GMR) effect includes a contribution that is due to anisotropic magnetoresistance (AMR). Unfortunately the AMR effect tends to degrade the peak-to-peak signal asymmetry. Additionally, a high AMR/GMR ratio causes a larger signal asymmetry variation. It is therefor desirable to reduce both the AMR contribution as well as the AMR/GMR ratio. This has been achieved by modifying the free layer through the insertion of an extra layer of a highly resistive or insulating material at approximately mid thickness level. This layer is from 3 to 15 Angstroms thick and serves to reduce the Anisotropic Magneto-resistance contribution to the total magneto-resistance of the device. This reduces the GMR contribution only slightly but cuts the AMR/GMR ratio in half, thereby improving cross-track asymmetry and signal linearity.

    摘要翻译： 巨磁电阻（GMR）效应包括归因于各向异性磁阻（AMR）。 不幸的是，AMR效应趋于降低峰 - 峰信号不对称性。 另外，高AMR / GMR比率导致更大的信号不对称变化。 因此，减少AMR贡献以及AMR / GMR比值是有希望的。 这已经通过在大约中等厚度水平上插入高电阻或绝缘材料的额外层来修饰自由层来实现。 该层厚度为3至15埃，用于降低各向异性磁阻对器件的总磁阻的贡献。 这仅略微降低了GMR贡献，但将AMR / GMR比率降低了一半，从而提高了交叉磁道不对称性和信号线性度。