发明授权
US06686072B2 Magnetic recording medium, process and apparatus for producing the same, and magnetic recording and reproducing apparatus 失效
磁记录介质,其制造方法和装置以及磁记录和再现装置

  • 专利标题: Magnetic recording medium, process and apparatus for producing the same, and magnetic recording and reproducing apparatus
  • 专利标题(中): 磁记录介质,其制造方法和装置以及磁记录和再现装置
  • 申请号: US09940853
    申请日: 2001-08-29
  • 公开(公告)号: US06686072B2
    公开(公告)日: 2004-02-03
  • 发明人: Akira SakawakiMasato KokubuHiroshi Sakai
  • 申请人: Akira SakawakiMasato KokubuHiroshi Sakai
  • 优先权: JPP2000-259871 20000829; JPP2000-335021 20001101
  • 主分类号: G11B566
  • IPC分类号: G11B566
Magnetic recording medium, process and apparatus for producing the same, and magnetic recording and reproducing apparatus
摘要:
A magnetic recording medium which exhibits excellent magnetic characteristics and which can be easily produced is disclosed. A magnetic recording medium containing a non-metallic substrate 1, a non-magnetic undercoat film 3, a cobalt alloy hexagonal closed packed (hcp) (110) textured magnetic film 4, and a protective film 5 formed on the substrate. An orientation-determining film 2, which determines the crystal orientation of an undercoat film provided directly thereon to cause the texture of the undercoat film to be (200), is formed between the substrate 1 and the undercoat film 3. The orientation-determining film 2 has a crystal structure such that columnar fine crystal grains 2a are inclined in a radial direction of the substrate 1, and the ratio of a coercive force in a circumferential direction of the medium (Hcc) to a coercive force in a radial direction of the medium (Hcr); i.e., Hcc/Hcr, is more than 1.
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