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    • 3. 发明专利
    • AT350748T
    • 2007-01-15
    • AT94921118
    • 1994-07-19
    • TAKAHASHI MIGAKU
    • TAKAHASHI MIGAKU
    • G11B5/64G11B5/73G11B5/851G11B5/66G11B5/84G11B5/85
    • An inexpensive high-density recording medium which is increased in coercive force without using expensive ferromagnetic metallic layer. In a magnetic recording medium on the base body of which a ferromagnetic metallic layer is formed on a base body with a metallic underlying layer in between and which utilizes reversal of magnetization, the oxygen concentration in the ferromagnetic metallic layer is 100 wt. ppm or less, and in addition, oxygen concentration in the metallic base layer is also 100 wt. ppm or less. In a method of manufacturing a magnetic recording medium on the base body of which the metallic base layer and ferromagnetic metallic layer are successively formed by sputtering, the impurity concentration of Ar gas used for the formation of the layer is 10 ppb or less. Before forming the metallic base layer, in addition, the surface of the base body is cleaned by high-frequency sputtering using Ar gas the impurity concentration of which is 10 ppb and surface section of the base body is partially removed to a depth of 0.2-1 nm.
    • 4. 发明专利
    • AT313145T
    • 2005-12-15
    • AT97908547
    • 1997-03-28
    • TAKAHASHI MIGAKU
    • TAKAHASHI MIGAKUNAKAI JUNICHI
    • G11B5/64G11B5/73G11B5/66H01F10/16
    • A magnetic recording medium having a high coercive force of a ferromagnetic metal layer, a high anisotropic magnetic field and/or normalized coercive force, and adaptable to high density recording. The magnetic recording medium comprises a substrate body and a ferromagnetic metal layer containing at least Co and Cr formed thereon via a metallic underlying layer of Cr. Magnetic inversion is utilized for the recording. A region (1) which penetrates through the ferromagnetic metal layer and in which Cr is segregated are formed among the crystal grains constituting the ferromagnetic metal layer. The Cr concentration in the intermediate portions of the region (1) in the direction of thickness of the ferromagnetic metal layer is smaller than that of the portions near the surface and near the metallic underlying layer. The crystal grains of the ferromagnetic metal layer are constituted by a region (2) in which the Cr concentration increases toward the grain boundary and a region (3) which is formed at the center of the crystalline particle and whose Cr concentration is lower than that near the grain boundary. The maximum Cr concentration in the region (3)b is smaller than the maximum Cr concentration in the region (2).