Invention Application
- Patent Title: Magnetic recording medium for high density recording and magnetic storage device using same
- Patent Title (中): 用于高密度记录和磁存储装置的磁记录介质
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Application No.: US12387164Application Date: 2009-04-28
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Publication No.: US20090258253A1Publication Date: 2009-10-15
- Inventor: Tatsuya Hinoue , Yotsuo Yahisa , Tomoo Yamamoto , Joe Inagaki , Hiroyuko Suzuki , Hidekazu Kashiwase
- Applicant: Tatsuya Hinoue , Yotsuo Yahisa , Tomoo Yamamoto , Joe Inagaki , Hiroyuko Suzuki , Hidekazu Kashiwase
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Priority: JP2004-372388 20041224
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer.
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