发明授权
- 专利标题: Perpendicular magnetic recording medium
- 专利标题(中): 垂直磁记录介质
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申请号: US12751329申请日: 2010-03-31
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公开(公告)号: US08895163B2公开(公告)日: 2014-11-25
- 发明人: Takahiro Onoue
- 申请人: Takahiro Onoue
- 申请人地址: SG Singapore
- 专利权人: WD Media (Singapore) Pte. Ltd.
- 当前专利权人: WD Media (Singapore) Pte. Ltd.
- 当前专利权人地址: SG Singapore
- 优先权: JP2009-087759 20090331; JP2010-077948 20100330
- 主分类号: G11B5/66
- IPC分类号: G11B5/66 ; G11B5/73 ; G11B5/667 ; G11B5/82
摘要:
In a perpendicular magnetic recording medium having, over a substrate, a magnetic recording layer, an underlayer made of Ru or a Ru compound and provided below the magnetic recording layer, a pre-underlayer made of a nonmagnetic crystalline material, and a soft magnetic layer provided below the pre-underlayer, when the difference between the highest point and the lowest point of unevenness of the interface between the soft magnetic layer and the pre-underlayer, derived by a cross-sectional TEM image, is given as an interface roughness (nm) and the distance between the soft magnetic layer and the magnetic recording layer, excluding the soft magnetic layer and the magnetic recording layer, is given as a SUL-MAG distance (nm), interface roughness (nm)≦0.4 (nm) and interface roughness×SUL-MAG distance (nm)≦12 (nm) are satisfied.
公开/授权文献
- US20100247965A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM 公开/授权日:2010-09-30