| 摘要 |
A method of magnetic transfer allows transfer of magnetic signals independently to two recording layers included in a magnetic recording medium. The coercive force Hc1 of an upper recording layer, the coercive force Hc2 of a lower recording layer formed below the upper recording layer, the strength Hex2 of a first transfer magnetic field, and the strength Hex1 of a second transfer magnetic field are set so that the following relations hold true: Hc1<Hc2, Hex1<Hex2, Hc1<Hex2, and Hex1<Hc2. The first transfer magnetic field Hex2 is applied to the recording medium to transfer magnetization patterns exclusively to the lower recording layer and to uniformly magnetize the upper recording layer. The second transfer magnetic field Hex1 is applied to the recording medium to transfer magnetization patterns exclusively to the upper recording layer 1a, while keeping the magnetization patterns in the lower recording layer 1b unaffected. A first and second master disks having different magnetization patterns can be applied to record different data in the upper and lower recording layers.
|
