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    • 1. 发明授权
    • Substrate for a perpendicular magnetic recording medium, perpendicular magnetic recording medium, and manufacturing methods thereof
    • 用于垂直磁记录介质的基板,垂直磁记录介质及其制造方法
    • US07361419B2
    • 2008-04-22
    • US10772082
    • 2004-02-04
    • Hiroyuki UwazumiYasushi SakaiMitsuo MasudaNorihiko Nakajima
    • Hiroyuki UwazumiYasushi SakaiMitsuo MasudaNorihiko Nakajima
    • G11B5/66
    • G11B5/8404G11B5/4555G11B5/667G11B5/82G11B5/858
    • A substrate for a perpendicular magnetic recording medium has a soft magnetic underlayer that functions as a soft magnetic backing layer of a perpendicular magnetic recording medium. The substrate for a perpendicular magnetic recording medium has a nonmagnetic base made of Al—Mg alloy or the like. The soft magnetic underlayer is formed of a Ni—P alloy containing phosphorus in a range of 0.5 wt % to 6 wt % formed by electroless plating on the nonmagnetic base. The substrate can also include a nonmagnetic underlayer formed by electroless plating on the base before electroless plating the soft magnetic underlayer. To form the perpendicular magnetic recording medium, the surface of the soft magnetic is textured using free abrasive grains. Thereafter, a nonmagnetic seed layer, a magnetic recording layer, and a protective layer can be formed by sputtering. A soft magnetic supplemental layer also can be formed on the soft magnetic underlayer before forming the seed layer.
    • 用于垂直磁记录介质的基板具有用作垂直磁记录介质的软磁背衬层的软磁性底层。 用于垂直磁记录介质的基板具有由Al-Mg合金等制成的非磁性基体。 软磁性底层由非磁性基底上通过化学镀形成的含有0.5重量%〜6重量%的磷的Ni-P合金形成。 基板还可以包括在对软磁性底层进行无电解电镀之前在基底上通过无电镀形成的非磁性底层。 为了形成垂直的磁记录介质,软磁表面使用自由的磨粒纹理。 此后,可以通过溅射形成非磁性种子层,磁记录层和保护层。 在形成种子层之前,也可以在软磁性底层上形成软磁性辅助层。