Invention Grant
- Patent Title: Perpendicular magnetic recording medium
- Patent Title (中): 垂直磁记录介质
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Application No.: US11998731Application Date: 2007-11-30
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Publication No.: US07691500B2Publication Date: 2010-04-06
- Inventor: Masayoshi Shimizu , Reiko Arai
- Applicant: Masayoshi Shimizu , Reiko Arai
- 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
- Agency: Townsend and Townsend and Crew LLP
- Agent Darren Gold
- Priority: JP2006-328520 20061205
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
Embodiments of the present invention help to provide an excellent perpendicular recording medium of high medium signal-to-noise (S/N) and with suppressed blurring in writing. According to one embodiment, a perpendicular recording layer is provided by way of a negative magnetic strain soft-magnetic underlayer above a substrate applied with texturing in the circumferential direction. The soft-magnetic underlayer has a first soft magnetic layer, a second soft magnetic layer and a nonmagnetic magnetic layer formed between the first soft magnetic layer and the second soft magnetic layer in which the first soft magnetic layer and the second soft magnetic layer are antiferromagnetically coupled to each other and the easy magnetization axis is directed in the radial direction.
Public/Granted literature
- US20080130170A1 Perpendicular magnetic recording medium Public/Granted day:2008-06-05
Information query
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