Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1984-03-20

1986-09-16

Andrews, Melvyn J.

Metal treatment

Stock

Magnetic

148403, 420 83, C22C 3800

Patent

active

046120688

ABSTRACT:
Amorphous thin film with easy magnetization axis perpendicular to film surface for magneto-optical recording with low recording power and high S/N in reading signal is set forth. The medium is an alloy of heavy rare earth element and iron with substitution of some heavy rare earth elements by light rare earth element, and the preferable chemical formula of the thin film is (R.sub.z A.sub.1-z).sub.x Fe.sub.1-x, or [(R.sub.z A.sub.1-z).sub.y B.sub.1-y ].sub.x Fe.sub.1-x where R is a light rare earth element, A and B are heavy rare earth elements, and the atom ratios satisfy 0.15.ltoreq.x.ltoreq.0.35, 0.00<y<1.00, 0.00<z<1.00. Recording is effected by using Curie point, or magnetic compensation temperature, and reading of information is effected by using the Kerr effect.

REFERENCES:
patent: 4126494 (1978-11-01), Imamura et al.
patent: 4308474 (1981-12-01), Savage et al.
patent: 4374665 (1983-02-01), Koon
patent: 4390600 (1983-06-01), Ohta et al.

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