Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1988-11-30
1991-05-21
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, 365122, G11B 1304, G11B 1114
Patent
active
050181190
ABSTRACT:
A method of reproducing a signal from a magneto-optical recording medium is disclosed in which the medium is formed of a first magnetic film, a second magnetic film and a third magnetic film which are magnetically coupled to one another at room temperature T.sub.RT, wherein the Curie points Tc1, Tc2 and Tc3 of the first, second and third magnetic films are in the relationship of Tc2>T.sub.RT Tc2<Tc1, and Tc2<Tc3, and the coercive force Hc1 of the first magnetic film is small in the vicinity of the Curie point Tc2 of the second magnetic film, and the coercive form Hc3 of the third magnetic film is larger than a minimum required magnetic field intensity within a temperature range between the room temperature TRT and a predetermined temperature T.sub.PB which is higher than the Curie point Tc2 of the second magnetic film. A signal is reproduced from the magneto-optical recording medium by heating it to the predetermined temperature T.sub.BP so as to interrupt the magnetic coupling between the first and third magnetic films when a magnetic field is applied.
REFERENCES:
patent: 4878132 (1989-10-01), Aratani et al.
patent: 4932012 (1990-06-01), Kobayashi
Aratani Katsuhisa
Kohno Minoru
Watanabe Kenjiro
Levy Stuart S.
Nguyen Hoa
Sony Corporation
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