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    • 8. 发明申请
    • PERPENDICULAR MEDIA WITH REDUCED SIDE TRACK ERASURE
    • 具有减少侧面跟踪的PERPENDICULAR MEDIA
    • US20100177439A1
    • 2010-07-15
    • US12353229
    • 2009-01-13
    • Kaizhong GaoQixu ChenChung-Hee ChangThomas Patrick Nolan
    • Kaizhong GaoQixu ChenChung-Hee ChangThomas Patrick Nolan
    • G11B5/82
    • G11B5/82G11B5/667
    • A media for perpendicular recording and a method of creating the media is provided. The media includes a hard recording layer and a soft underlayer (SUL). The SUL is composed of at least two anti-ferromagnetically coupled (AFC) sub-underlayers. The sub-underlayers respond to a magnetic field established during dynamic reversal with respective magnetic fields. The sub-underlayers are formed and disposed to differ in one or more magnetic moment, anisotropy, and thickness, so that their respective magnetic fields constructively interfere in one or more points in the hard recording layer, thereby reducing a total SUL magnetic field response to the dynamic reversal field approximately to zero at one or more points in the hard recording layer, which reduces side track erasure.
    • 提供了用于垂直记录的介质和创建介质的方法。 介质包括硬记录层和软底层(SUL)。 SUL由至少两个反铁磁耦​​合(AFC)子底层组成。 副底层响应于用相应的磁场在动态反转期间建立的磁场。 亚底层被形成和设置为在一个或多个磁矩,各向异性和厚度上不同,使得它们各自的磁场建构性地干扰硬记录层中的一个或多个点,从而减少总SUL磁场响应 在硬记录层中的一个或多个点处的动态反转场大致为零,这减少了侧轨道擦除。
    • 9. 发明授权
    • Texture-induced magnetic anisotropy of soft underlayers for perpendicular recording media
    • 用于垂直记录介质的软底层的纹理感应磁各向异性
    • US06667118B1
    • 2003-12-23
    • US09911738
    • 2001-07-25
    • Chung-Hee ChangRajiv Yadav Ranjan
    • Chung-Hee ChangRajiv Yadav Ranjan
    • G11B566
    • G11B5/667G11B5/656G11B5/7315G11B5/8404Y10S428/90Y10T428/24975Y10T428/265
    • Perpendicular magnetic recording media having no, or substantially reduced, Barkhausen noise are manufactured by a method comprising steps of: (a) providing a non-magnetic substrate having a surface; (b) providing the surface of the substrate with a unidirectional texture pattern; (c) forming an underlayer of a soft magnetic material over the unidirectional texture pattern, the layer of soft magnetic material having positive magnetostriction and uniaxial magnetic anisotropy and including a multiplicity of magnetic domains; and (d) forming a magnetic recording layer of a hard magnetic material over the underlayer; wherein the uniaxial magnetic anisotropy of the underlayer of soft magnetic material is sufficiently large to orient the magnetic domains thereof along the axis of the uniaxial magnetic anisotropy and thereby restrict domain wall formation and/or movement, whereby generation of Barkhausen noise in the soft underlayer is suppressed.
    • 通过包括以下步骤的方法制造没有或基本上减少的巴克豪森噪声的垂直磁记录介质:(a)提供具有表面的非磁性基板;(b)为基板的表面提供单向纹理图案; (c)在单向纹理图案上形成软磁材料的底层,所述软磁材料层具有正的磁致伸缩和单轴磁各向异性并且包括多个磁畴; 以及(d)在所述底层上形成硬磁性材料的磁记录层;其中,所述软磁性材料的底层的单轴磁各向异性足够大以使其沿着所述单轴磁各向异性轴的方向取向, 畴壁形成和/或移动,从而抑制软底层中的巴克豪森噪声的产生。
    • 10. 发明授权
    • Recording layer and multilayered soft underlayer
    • 记录层和多层软底层
    • US08338005B2
    • 2012-12-25
    • US12353229
    • 2009-01-13
    • Kaizhong GaoQixu ChenChung-Hee ChangThomas Patrick Nolan
    • Kaizhong GaoQixu ChenChung-Hee ChangThomas Patrick Nolan
    • G11B5/667
    • G11B5/82G11B5/667
    • A media for perpendicular recording and a method of creating the media is provided. The media includes a hard recording layer and a soft underlayer (SUL). The SUL is composed of at least two anti-ferromagnetically coupled (AFC) sub-underlayers. The sub-underlayers respond to a magnetic field established during dynamic reversal with respective magnetic fields. The sub-underlayers are formed and disposed to differ in one or more magnetic moment, anisotropy, and thickness, so that their respective magnetic fields constructively interfere in one or more points in the hard recording layer, thereby reducing a total SUL magnetic field response to the dynamic reversal field approximately to zero at one or more points in the hard recording layer, which reduces side track erasure.
    • 提供了用于垂直记录的介质和创建介质的方法。 介质包括硬记录层和软底层(SUL)。 SUL由至少两个反铁磁耦​​合(AFC)子底层组成。 副底层响应于用相应的磁场在动态反转期间建立的磁场。 亚底层被形成和设置为在一个或多个磁矩,各向异性和厚度上不同,使得它们各自的磁场在硬记录层中的一个或多个点上建构性地干扰,从而减少总SUL磁场响应 在硬记录层中的一个或多个点处的动态反转场大致为零,这减少了侧轨道擦除。