Garnet polycrystalline film for magneto-optical recording medium

Details Garnet polycrystalline film for magneto-optical recording medium Garnet polycrystalline film for magneto-optical recording medium

1991-11-13

1996-03-26

Kiliman, L.

Stock material or miscellaneous articles

Composite

Of inorganic material

428694SC, 428694GT, 428694RE, 428694MM, 428694ST, 428670, 428678, 428702, 428900, 252 6251R, 252 6257, 252 6258, 252 626, G11B 566, C04B 3500

Patent

active

055019137

ABSTRACT:
A garnet polycrystalline film for a magneto-optical recording medium including at least two layers of polycrystalline garnet represented by Bi.sub.x R.sub.3-x M.sub.Y Fe.sub.5-Y O.sub.12, where 0.ltoreq.X.ltoreq.3, 0 Y.ltoreq.5, R represents one or more rare earth elements containing yttrium, and M represents Ga, Al or In, wherein crystal lattice constants of these adjacent two layers are different from each other by .+-.0.3% or more, and an average crystal grain diameter of one of the layers is smaller than that of the other layer and 1 .mu.m or less, and a magneto-optical recording disk using this garnet polycrystalline film.

REFERENCES:
patent: 4608142 (1986-08-01), Gomi et al.
patent: 4728178 (1988-03-01), Gualtieri et al.
Fujitsu Scientific and Technical Journal, vol. 26, No. 2, Jun. 1990, Kawasaki, pp. 156-163--K. Shono, H. Kano and S. Kuroda--Sputtered Garnet Media for Magneto-optic Recording, p. 157, col. 2, line 13-line 15; FIG. 2--p. 158, col. 1, line 14-col. 2, line 7.
Patent Abstracts of Japan, vol. 13, No. 80 (P-832) 23 Feb. 1989 & JP-A-63 261 555 (Fujitsu) 28 Oct. 1988.
Patent Abstracts of Japan, vol. 12, No. 46 (P-665) 12 Feb. 1988 & JP-A-62 192 047 (Fujitsu) 22 Aug. 1987.
Journal of Magnetism and Magnetic Materials, vol. 84, 1990, pp. 222-228--M. Abe and M. Gomi--Magneto-optical Recording on Garnet Films--p. 226, col. 2, line 43-p. 227, col. 1, line 25; FIG. 7.
H. Kano et al: IEEE Trans, Magn. MAG-25 (5), 3737 (1989).
The Digests of the 12th Annual Conference on Magnetics in Japan 127 (1989) by Ito et al.
The Digests of the 13th Annual Conference on Magnetics in Japan 49 (1989) by T. Suzuki et al. (Abstract only).
M. Abe and M. Gomi J. Magn. Magn. Matler, 84,222 (1990).
The Digests of the 10th Annual Conference on Magnetics in Japan, 31 (1986) by Ito et al.
"Sputtlered Garnet Film for Magneto-optical Disk", Light and Magnetism--Basis and Application Magnetism Seminar Text, 107 (1988).

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