Invention Grant
- Patent Title: Perpendicular magnetic recording medium with tilted easy axis of magnetization, method of manufacturing magnetic recording medium, and magnetic recording apparatus comprising magnetic recording medium
- Patent Title (中): 具有倾斜易磁化轴的垂直磁记录介质,制造磁记录介质的方法和包括磁记录介质的磁记录装置
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Application No.: US11492809Application Date: 2006-07-26
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Publication No.: US07989097B2Publication Date: 2011-08-02
- Inventor: Tomoyuki Maeda
- Applicant: Tomoyuki Maeda
- Applicant Address: JP Tokyo
- Assignee: Kabushiki Kaisha Toshiba
- Current Assignee: Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo
- Agency: Pillsbury Winthrop Shaw Pittman, LLP
- Priority: JP2005-216199 20050726
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
According to one embodiment, a magnetic recording medium includes a substrate, a first underlayer formed on the substrate and including an amorphous alloy containing Ni, a crystalline second underlayer formed on the first underlayer and including simple Cr or an alloy containing Cr, and a magnetic recording layer formed on the second underlayer and including at least one element of Fe and Co and at least one element of Pt and Pd, and containing magnetic crystal grains having an L10 structure. An oxygen amount remaining on the upper surface of the second underlayer is larger than an oxygen amount remaining on the lower surface of the second underlayer, and a normal line to a (001) plane of the magnetic crystal grains in the magnetic recording layer is oriented with a tilt angle in a range of 3 to 25° to a normal line to a medium plane.
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