Optical information recording medium comprising two magneto-opti

Details Optical information recording medium comprising two magneto-opti Optical information recording medium comprising two magneto-opti

1993-03-30

1994-11-08

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428694MM, 428694RL, 428694DE, 428694SC, 428913, 369288, B32B 300

Patent

active

053625374

ABSTRACT:
For use in recording information by an irradiation of a laser beam, an optical information recording medium comprises a substrate transparent for the laser beam and a first and a second magneto-optical layer which are made of GdFeTi and TbFeCo, respectively. The first magneto-optical layer is between the substrate and the second magneto-optical layer and thermally coupled to the second magneto-optical layer. For carrying out a recording operation, the laser beam is irradiated to the substrate to heat the first magneto-optical layer. A temperature of the first magneto-optical layer is transferred to the second magneto-optical layer. In this condition, the second magneto-optical layer is subjected to a magnetic field representative of information. As a result, the information is recorded as recorded information to the second magneto-optical layer. The recorded information is transferred from the second magneto-optical layer to the first magneto-optical layer with decreasing of the temperature of the first magneto-optical layer. The recorded information can be read from the first magneto-optical layer in the manner known in the art.

REFERENCES:
patent: 5075145 (1991-12-01), Yamamoto et al.
patent: 5093174 (1992-03-01), Suzuki et al.
patent: 5292592 (1994-03-01), Itoh
Goro Fujita et al., "A Magneto-Optical Recording Method of Magnetic . . . Pulsed Laser Irradiation", Japanese Journal of Applied Physics, vol. 28 (1989) Supplement 28-3, pp. 329-333.
Sakuya Tamada et al., "Design Concept of Magneto-Optical Disk", Japanese Journal of Applied Physics, vol. 28 (1989) Supplement 28-3, pp. 67-70.

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