发明授权
- 专利标题: Magnetic recording media with ultra-high recording density
- 专利标题(中): 具有超高记录密度的磁记录介质
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申请号: US11226971申请日: 2005-09-14
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公开(公告)号: US07645528B2公开(公告)日: 2010-01-12
- 发明人: Fumiko Akagi , Tatsuya Hinoue , Atsushi Nakamura , Tomoo Yamamoto
- 申请人: Fumiko Akagi , Tatsuya Hinoue , Atsushi Nakamura , Tomoo Yamamoto
- 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: JP2004-268399 20040915
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
An AFC magnetic recording medium having a three-layered ferromagnetic structure capable of reducing noises without deteriorating thermal stability is provided in order to achieve ultra-high recording density. In one embodiment, the AFC magnetic recording medium has a magnetic recording layer formed on a substrate via an underlayer, the magnetic recording medium consisting of a first ferromagnetic layer formed on the underlayer, a second ferromagnetic layer formed on the first ferromagnetic layer via a nonmagnetic layer inducing the antiferromagnetic interaction, and a third ferromagnetic layer formed on the second ferromagnetic layer, wherein the center of gravity G of the magnetic recording medium is defined using the distance tg from the upper surface of the third ferromagnetic layer as: tg=(Mst)eff/(2MS3); when the center of gravity G is at the third ferromagnetic layer, tg=((Mst)eff/2−MS3t3)/MS2+t3; when the center of gravity G is at the second ferromagnetic layer, and when the total film thickness of the magnetic recording layer is ttotal, the value tg/ttotal is lower than about 0.33.
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