Magneto-optical disk

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

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428694ML, 428694DE, 428694RL, 428694MM, 428694EC, 428694GR, 428694RE, 428900, 360131, 360135, 365122, 369 13, B32B 302, G11B 566

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active

054863953

ABSTRACT:
A magneto optical disk comprising: a circular substrate; a recording layer, formed on the substrate, for magneto-optical recording of information; a readout layer, formed between the substrate and the recording layer, for the reproduction of information recorded on the recording layer, wherein the readout layer has a Curie temperature which is higher than the Curie temperature of the recording layer, and exhibits in-plane magnetization at room temperature and a change from in-plane magnetization to perpendicular magnetization when its temperature rises over a certain temperature as a result of the application of a light beam, and wherein the magnetic compensation temperature is set such that it increases from the peripheral edge of the magneto-optical disk toward the center thereof. When the magneto-optical disk is used with a magneto-optical recording and reproducing device using a CAV system, it achieves high-density recording and the reproduction of signals with reduced noise, without causing the light beam control system to be complicated.

REFERENCES:
patent: 4559573 (1985-12-01), Tanaka et al.
patent: 4670356 (1987-06-01), Sato
patent: 4982389 (1991-01-01), Nakao et al.
"Super Resolution in Magneto-Optical Disks" (Journal of Japanese Society of Applied Magnetics, vol. 15, No. 5, 1991), M. Kaneko, et al.
"Some Magnetooptical and HF Properties of Magnetic Films" (IEEE GTransactions on Magnetics, vol. MAG-10, No. 4, Dec., 1974, New York, USA).
Co-pending application, U.S. patent application Ser. No. 07/870,630, filed on Apr. 16, 1992 now abandoned.

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