Magneto-optical recording medium and method for producing the sa

Details Magneto-optical recording medium and method for producing the sa Magneto-optical recording medium and method for producing the sa

1993-04-14

1997-02-04

Kiliman, Leszek

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Continuous and nonuniform or irregular surface on layer or...

428694ML, 428694GT, 428694EC, 428694MM, 428900, G11B 566, B32B 310

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active

055996051

ABSTRACT:
A magneto-optical recording medium having a recording layer made of a bismuth-substituted garnet and deposited by a sputtering over an amorphous substrate of aluminosilicate or borosilicate glass, the recording medium including a garnet underlayer of either a double-layer or single-layer structure. The formation of an underlayer of a double-layer structure made of garnet reduces the level of noise due to light scattering at crystalline boundaries in the garnet film. The formation of an underlayer of a single-layer structure made of a garnet having a lower crystallization temperature than a YIG film is also effective to noise-level reduction. An underlayer has a surface smoothness corresponding to a roughness of approximately 10 .ANG., which is improved from the surface smoothness of a conventional underlayer comprising a YIG film.

REFERENCES:
patent: 4645722 (1987-02-01), Katayama et al.
patent: 4842956 (1989-06-01), Kabayashi
patent: 5016232 (1991-05-01), Tadokoro et al.
"Multi-layered Garnet Films for High Density MO Memory", Itoh et al; Digests of the 10th Annual Conf. on Magnetics in Japan, 31. (1986).

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