Method and system for erasing previously recorded domains in a m

Details Method and system for erasing previously recorded domains in a m Method and system for erasing previously recorded domains in a m

1991-05-10

1993-02-02

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365122, G11B 1304, G11B 1110, G11B 1112

Patent

active

051843358

ABSTRACT:
Methods for directly over-writing the binary data value of a bit of digital data, stored in a particular one of a multiplicity of microscopic storage regions of a thin-film magneto-optic recording layer, in the absence of a substantial externally applied bias magnetic field, employ a magnetic material having a compensation temperature a few tens of degrees centigrade above room temperature. A source of energy is energized to heat the particular storage region to a sufficiently high temperature that the self-demagnetization field of the recording layer material inverts the net magnetic moment of that region. Multiple over-writing of the long-term stable stored data values can be provided.

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Nippon Kogaku K.K., "Overwrite System of Magneto Optical Disk System", International Symposium on Magneto-Optics, Apr., 1987.

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