Magneto-optical recording method and medium for recording three-

Details Magneto-optical recording method and medium for recording three- Magneto-optical recording method and medium for recording three-

1993-07-12

1994-10-25

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692752, 369110, G11B 1304

Patent

active

053595793

ABSTRACT:
A magneto-optical recording medium which allows overwriting of three-value information and sufficiently satisfies read/write requirements necessary for practical use and a magneto-optical recording method which allows writing and reading out of three-value information readily with a high degree of accuracy are disclosed. In an initial condition, first and second recording films are magnetized in a same initial direction, and the first recording film has a threshold value for a recording magnetic field, which is a minimum magnetic field necessary to reverse the magnetization direction, lower by a predetermined amount than the threshold value of the second recording film. By selecting the magnitude and the direction of a magnetic field to be applied, three-value recording among the initial condition wherein both of the first and second recording films are magnetized in the initial direction, a first condition wherein only the first recording film is magnetized in the direction opposite to the initial direction, and a second condition wherein the first and second recording films are magnetized in the opposite direction can be realized for each pit.

REFERENCES:
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patent: 5175714 (1992-12-01), Kikitsu et al.
patent: 5202880 (1993-04-01), Lee et al.
patent: 5210724 (1993-05-01), Kobayashi
patent: 5282095 (1994-01-01), Spruit et al.
N. Saito et al., "Multi-Valued Magneto-Optical Recording in TbFe/SiO Compositionally Modulated Films", Digests of the 13th Annual Conference on Magnetics in Japan, 1989, p. 63.

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