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    • 10. 发明授权
    • Magnetically capped dual magnetoresistive reproduce head
    • 磁阻双磁阻复制头
    • US5644456A
    • 1997-07-01
    • US583578
    • 1996-01-05
    • Neil SmithJay D. Freeman
    • Neil SmithJay D. Freeman
    • G11B5/39G11B5/147
    • G11B5/3938G11B5/3948G11B5/3954G11B5/3987
    • 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.
    • 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。