发明授权
- 专利标题: Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus using the same
- 专利标题(中): 垂直磁记录介质和使用其的磁记录/再现装置
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申请号: US12288654申请日: 2008-10-21
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公开(公告)号: US08771849B2公开(公告)日: 2014-07-08
- 发明人: Hiroaki Nemoto , Ikuko Takekuma , Ichiro Tamai , Yoshiyuki Hirayama
- 申请人: Hiroaki Nemoto , Ikuko Takekuma , Ichiro Tamai , Yoshiyuki Hirayama
- 申请人地址: NL Amsterdam
- 专利权人: HGST Netherlands B.V.
- 当前专利权人: HGST Netherlands B.V.
- 当前专利权人地址: NL Amsterdam
- 代理机构: Zilka-Kotab, PC
- 优先权: JP2007-286391 20071102
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.