Invention Grant
- Patent Title: Magnetic recording medium, magnetic storage and method for reproducing information from magnetic recording medium
- Patent Title (中): 磁记录介质,磁存储器和用于从磁记录介质再现信息的方法
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Application No.: US12359641Application Date: 2009-01-26
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Publication No.: US07768731B2Publication Date: 2010-08-03
- Inventor: Akihiro Inomata , Antony Ajan , Jun Taguchi , Koji Matsumoto , Wataru Yamagishi
- Applicant: Akihiro Inomata , Antony Ajan , Jun Taguchi , Koji Matsumoto , Wataru Yamagishi
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Greer, Burns & Crain, Ltd.
- Priority: JP2004-000632 20040105; JP2004-061225 20040304
- Main IPC: G11B5/02
- IPC: G11B5/02

Abstract:
A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1−Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.
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