发明申请
- 专利标题: MAGNETIC RECORDING MEDIUM
- 专利标题(中): 磁记录介质
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申请号: US13372116申请日: 2012-02-13
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公开(公告)号: US20120225325A1公开(公告)日: 2012-09-06
- 发明人: HIROAKI NEMOTO , Ikuko TAKEKUMA , Kimio NAKAMURA , Junichi SAYAMA
- 申请人: HIROAKI NEMOTO , Ikuko TAKEKUMA , Kimio NAKAMURA , Junichi SAYAMA
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 优先权: JP2011-045496 20110302
- 主分类号: G11B5/66
- IPC分类号: G11B5/66 ; B32B15/04
摘要:
Surface flatness of magnetic recording medium to which a magnetic recording layer made of L10 FePt magnetic alloy thin film, with distance between a magnetic head and a magnetic recording medium sufficiently reduced. The magnetic recording layer includes: magnetic layers containing a magnetic alloy including Fe and Pt as principal materials; and one non-magnetic material selected from carbon, oxide and nitride. The first magnetic layer disposed closer to a substrate has a granular structure in which magnetic alloy grains including FePt alloy as the principal material are separated from grain boundaries including the non-magnetic material as the principal material. The second magnetic layer disposed closer to the surface than the first magnetic layer is fabricated so as to have a homogeneous structure in which an FePt alloy and the non-magnetic material are mixed in a state finer than diameters of the FePt magnetic alloy grains in the first magnetic layer.
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