Invention Grant
- Patent Title: Magnetic recording medium substrate and perpendicular magnetic recording medium
- Patent Title (中): 磁记录介质基板和垂直磁记录介质
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Application No.: US11887539Application Date: 2006-03-27
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Publication No.: US07955723B2Publication Date: 2011-06-07
- Inventor: Teiichiro Umezawa , Yoshiaki Sonobe , Kong Kim
- Applicant: Teiichiro Umezawa , Yoshiaki Sonobe , Kong Kim
- Applicant Address: SG Singapore
- Assignee: WD Media (Singapore) Pte.Ltd.
- Current Assignee: WD Media (Singapore) Pte.Ltd.
- Current Assignee Address: SG Singapore
- Priority: JP2005-102422 20050331
- International Application: PCT/JP2006/306148 WO 20060327
- International Announcement: WO2006/106628 WO 20061012
- Main IPC: G11B5/66
- IPC: G11B5/66 ; B32B5/16

Abstract:
A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spike noise and medium noise can be positively suppressed when information recording and reproduction are carried out at high recording surface density. At least one pair of soft magnetic layers are laid and formed via a non-magnetic layer on a substrate of a non-magnetic material so that magnetic characteristics obtained by integrating the pair of soft magnetic layers have a magnetic hysteresis to thereby prevent the formation of a magnetic domain wall.
Public/Granted literature
- US20100203358A1 Magnetic Recording Medium Substrate and Perpendicular Magnetic Recording Medium Public/Granted day:2010-08-12
Information query
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