Method of magnetic transfer to magnetic recording medium...

Details Method of magnetic transfer to magnetic recording medium... Method of magnetic transfer to magnetic recording medium...

2005-04-12

2005-04-12

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

Reexamination Certificate

active

06879453

ABSTRACT:
A method of magnetic transfer allows transfer of magnetic signals independently to two recording layers included in a magnetic recording medium. The coercive force Hc1of an upper recording layer, the coercive force Hc2of a lower recording layer formed below the upper recording layer, the strength Hex2of a first transfer magnetic field, and the strength Hex1of 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 Hex2is 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 Hex1is applied to the recording medium to transfer magnetization patterns exclusively to the upper recording layer1a, while keeping the magnetization patterns in the lower recording layer1bunaffected. A first and second master disks having different magnetization patterns can be applied to record different data in the upper and lower recording layers.

REFERENCES:
patent: 5367508 (1994-11-01), Haba
patent: 20020186488 (2002-12-01), Nishikawa et al.

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