Invention Grant
- Patent Title: Magnetic recording media with ultra-high recording density
- Patent Title (中): 具有超高记录密度的磁记录介质
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Application No.: US11226971Application Date: 2005-09-14
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Publication No.: US07645528B2Publication Date: 2010-01-12
- Inventor: Fumiko Akagi , Tatsuya Hinoue , Atsushi Nakamura , Tomoo Yamamoto
- Applicant: Fumiko Akagi , Tatsuya Hinoue , Atsushi Nakamura , Tomoo Yamamoto
- 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: JP2004-268399 20040915
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
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.
Public/Granted literature
- US20060057428A1 Magnetic recording media with ultra-high recording density Public/Granted day:2006-03-16
Information query
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