发明授权
US06761982B2 Magnetic recording medium, production process and apparatus thereof, and magnetic recording and reproducing apparatus 失效
磁记录介质,制造方法及其装置以及磁记录和再现装置

  • 专利标题: Magnetic recording medium, production process and apparatus thereof, and magnetic recording and reproducing apparatus
  • 专利标题(中): 磁记录介质,制造方法及其装置以及磁记录和再现装置
  • 申请号: US10029153
    申请日: 2001-12-28
  • 公开(公告)号: US06761982B2
    公开(公告)日: 2004-07-13
  • 发明人: Akira SakawakiHiroshi Sakai
  • 申请人: Akira SakawakiHiroshi Sakai
  • 优先权: JPP2000-403307 20001228
  • 主分类号: G11B566
  • IPC分类号: G11B566
Magnetic recording medium, production process and apparatus thereof, and magnetic recording and reproducing apparatus
摘要:
A magnetic recording medium containing a non-magnetic substrate, an orientation-determining layer for causing the non-magnetic undercoat layer assume to have a predominant orientation plane of (200), a non-magnetic undercoat layer, a magnetic layer, and a protective layer, in order, is disclosed. The non-magnetic undercoat layer 3 has a bcc structure; the orientation-determining layer has a crystal structure in which columnar fine crystal grains are inclined in a radial direction; and the ratio of a coercive force in a circumferential direction of the magnetic layer (Hcc) to a coercive force in a radial direction of the magnetic layer 4 (Hcr)is more than 1. The magnetic layer includes a plurality of magnetic films and having an hcp structure and a predominant orientation plane of (110), and permits antiferromagnetic bonding to be formed therebetween.
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