A magneto-optical recording system including a recording medium

Details A magneto-optical recording system including a recording medium A magneto-optical recording system including a recording medium

1993-05-14

1995-05-02

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 1304

Patent

active

054126274

ABSTRACT:
Light beams having two different power levels are radiated on a magneto-optical medium having a recording layer and a bias layer magnetostatically coupled to the recording layer, thereby recording and erasing information. Upon radiation of a high level beam, a beam irradiated portion of the recording layer is heated to reach a magnetization reversal temperature, and the direction of magnetization of the irradiated portion follows a direction of a leakage field generated by a magnetization distribution formed by heating of the bias layer. Upon radiation of a low level beam, a beam irradiated portion of the recording layer is heated to reach a magnetization reversal temperature to cause the bias layer to generate a leakage field having a magnitude smaller than that upon radiation of the high level beam. In this case, the direction of magnetization of the recording layer is opposite to that of the leakage field obtained upon radiation of the high level beam. The directions of magnetization of the bias layer are kept unchanged before and after the radiation of the high level beam and before and after the radiation of the low level beam.

REFERENCES:
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patent: 4794560 (1988-12-01), Bell et al.
patent: 4955007 (1990-09-01), Aratami et al.
patent: 5087532 (1992-02-01), Challener, IV
patent: 5105400 (1992-04-01), Kikitsu et al.
IBM Technical Disclosure Bulletin, vol. 32, No. 4A, pp. 384-386, Sep. 1989, "Thermomagnetic Recording Medium for a Direct-Overwrite Recording System".
Applied Physics Letter, vol. 52, No. 18, pp. 1537-1539, D. Rugar, et al, May 2, 1988, "Thermomagnetic Direct Overwrite in TbFe Using Thermally Induced Domain Wall Energy Gradient".

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