Magneto-optical recording medium having protective film with inc

Details Magneto-optical recording medium having protective film with inc Magneto-optical recording medium having protective film with inc

1989-07-07

1990-08-21

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of metal

428694, 428697, 428702, B32B 900, G11B 566

Patent

active

049505475

ABSTRACT:
A magneto-optical recording medium includes one selected from a compound of strontium titanate (SrTiOx), a compound of barium titanate (BaTiOx), a nitrogen compound of strontium titanate (SrTiOxNy), and a nitrogen compound of barium titanate (BaTiOxNy). The magneto-optical recording medium has a large value for the refractive index n and a small value for the extinction coefficient k; moreover, the medium is resistive against corrosions. For the magneto-optical recording medium, there is produced a protective film by simultaneously sputtering a film forming target and a composition adjusting target. The deposition of the protective film is achieved in a mixed atmosphere of an inert gas and oxygen or in a mixed gas of an inert gas and nitrogen.

REFERENCES:
patent: 4578729 (1986-03-01), Suzuki et al.
patent: 4656088 (1987-04-01), Tokunaga et al.
patent: 4828899 (1989-05-01), Arioka et al.
patent: 4835032 (1989-05-01), Arioka et al.
patent: 4837116 (1989-06-01), Arioka et al.
"Hikarijiki Disk", supervised by Nobutake Imamura & published by Triceps Co., Ltd., in Japan on Feb. 20, 1986, referred to on p. 2 of the specification.
"Theory of Yuudentairon", written by Shoten Oka & published by Gendai Kohgakusha, in Japan on May 15, 1977, referred to on p. 72 of the specification.
"Kerr-Effect Enhancement and Improvement of Readout Characteristics in MnBi Film Memory", J. Appl. Phys., vol. 45, No. 8, Aug. 1974.

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