发明授权
- 专利标题: Magnetic recording medium and magnetic recording and reproducing apparatus
- 专利标题(中): 磁记录介质和磁记录和再现装置
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申请号: US12674602申请日: 2008-08-25
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公开(公告)号: US08133601B2公开(公告)日: 2012-03-13
- 发明人: Gohei Kurokawa , Yuzo Sasaki , Tatsu Komatsuda , Atsushi Hashimoto
- 申请人: Gohei Kurokawa , Yuzo Sasaki , Tatsu Komatsuda , 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: JP2007-226399 20070831
- 国际申请: PCT/JP2008/065089 WO 20080825
- 国际公布: WO2009/028447 WO 20090305
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
A magnetic recording medium is provided which can record and reproduce high-density information by maintaining perpendicular orientation of a magnetic recording layer even with a decrease in thickness of nonmagnetic layers from an intermediate layer to a seed layer while decreasing the grain size of magnetic crystal grains to be consistent with an increase in recording density. A manufacturing method thereof and a magnetic recording and reproducing apparatus are also provided. The magnetic recording medium is a perpendicular magnetic recording medium including at least an underlying layer, an orientation control layer, a magnetic recording layer, and a protective layer formed on a nonmagnetic substrate. Here, the orientation control layer includes two or more layers of a seed layer and an intermediate layer from the substrate side. Materials of the seed layer and the intermediate layer are selected so that a contact angle of the intermediate layer material with respect to the seed layer material, which is amorphous, is in the range of 10 to 100 degrees.