发明授权
- 专利标题: Perpendicular magnetic recording media and magnetic storage apparatus using the same
- 专利标题(中): 垂直磁记录介质及使用其的磁存储装置
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申请号: US10977552申请日: 2004-10-29
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公开(公告)号: US07368185B2公开(公告)日: 2008-05-06
- 发明人: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
- 申请人: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
- 申请人地址: NL Amsterdam
- 专利权人: Hitachi Global Storage Technologies Netherlands B.V.
- 当前专利权人: Hitachi Global Storage Technologies Netherlands B.V.
- 当前专利权人地址: NL Amsterdam
- 代理机构: Townsend and Townsend and Crew LLP
- 代理商 Darren Gold
- 优先权: JP2003-427706 20031224
- 主分类号: G11B5/66
- IPC分类号: G11B5/66 ; G11B5/70
摘要:
Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
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