发明授权
- 专利标题: Thermal-assist magnetic recording medium and magnetic recording and reproducing apparatus
- 专利标题(中): 热辅助磁记录介质和磁记录和再现装置
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申请号: US12627719申请日: 2009-11-30
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公开(公告)号: US08705207B2公开(公告)日: 2014-04-22
- 发明人: Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
- 申请人: Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
- 申请人地址: JP Tokyo
- 专利权人: Showa Denko K.K.
- 当前专利权人: Showa Denko K.K.
- 当前专利权人地址: JP Tokyo
- 代理机构: Sughrue Mion, PLLC
- 优先权: JP2008-306653 20081201
- 主分类号: G11B5/82
- IPC分类号: G11B5/82
摘要:
A thermal-assist magnetic recording medium is provided which can accomplish a surface recording density of 1 Tbit/inch2. The thermal-assist magnetic recording medium includes: a substrate; a plurality of underlying layers formed on the substrate; a first magnetic layer formed on the underlying layers; a coupling control layer formed on the first magnetic layer and formed of a ferromagnetic alloy; and a second magnetic layer formed on the coupling control layer. Here, Curie temperatures of the first magnetic layer and the second magnetic layer are higher than the Curie temperature of the coupling control layer, an anisotropy magnetic field of the first magnetic layer is greater than the anisotropy magnetic field of the second magnetic layer, and a saturation magnetic field has a minimum value at a temperature of 350° C. or lower.