Magneto-optical recording medium, disk and method of manufacturi

Details Magneto-optical recording medium, disk and method of manufacturi Magneto-optical recording medium, disk and method of manufacturi

1994-02-24

1997-12-30

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428336, 428694ML, 428694SC, 428694GT, 428694MM, 428900, 369 13, G11B 566

Patent

active

057027935

ABSTRACT:
A high density magneto-optical recording medium utilizing a polycrystalline garnet two-layer film. The film thickness of an under layer of the garnet polycrystal on a glass substrate is made 100 nm or less, and a crystal grain diameter of a recording layer formed thereon is made 0.1 .mu.m or less. Furthermore, the under layer is demagnetized at room temperature. With this, a bit having a regular shape can be written, thus reducing medium noise by a large margin.

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Shimokawa, et al., Garnet Bilayer Films for Magneto-Optical Recording Media, 17th lecture meeting of The Magnetics Society of Japan (Figures Only).
Magneto-Optical Recording International Symposium '92, Jour. of The Magnetics Society of Japan, vol. 17 (S1), 1993, pp. 85-88.
Cho, et al., Bi-substituted iron garnet films with fine grains prepared by pyrolysis, J. Appl. Phys. 70(10), 1991, pp. 6301-6303.
Itoh, et al., Double-Layered Garnet Films on Glass Substrate for High Carrier-to-Noise Ratio on Magnetooptical Recording, Jpn. J. Appl. Phys., vol. 31, 1992, pp. 790-792.
Suzuki, et al., Magnetic and magneto-optic properties of Bi-substituted garnet films crystallized by rapid thermal processing, J. Apply. Phys. 67(9), 1990, pp. 4435-4437.
Nakagawa, et al., Crystal Growth Process of Rb-Doped Iron Garnet Films for M-O Recording Prepared by Pyrolysis, Jpn. J. Appl. Phys., vol. 29(9), 1990, pp. 1690-1695.
Kobayashi, et al., Magnetization Process of Exchange-Coupled Ferrimagnetic Double-Layered Films, Jpn. J. Appl. Phys., vol. 20(11), 1981, pp. 2089-2095.
Shimokawa, et al., Jpn. J. Appl. Phys. 17, 1993, Lopc-10, p. 66.

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