Invention Grant
US07768731B2 Magnetic recording medium, magnetic storage and method for reproducing information from magnetic recording medium 有权
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

Magnetic recording medium, magnetic storage and method for reproducing information from magnetic recording medium
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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