G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.3
G11B 11/10 (2006.01)
Patent
CA 1315880
ABSTRACT OF THE DISCLOSURE 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 magnetically coupled to one another at room temperature TRT, wherein the Curie points Tc1, Tc2 and Tc3 of the first, second and third magnetic films are in the relationship of TC2 > TRT, Tc2 < Tc1, and Tc2 < Tc3, and the coercive force Tc1 of the first magnetic film is sufficiently small in the vicinity of the Curie point Tc2 of the second magnetic film, while the coercive force Hc3 of the third magnetic film is sufficiently greater than a required magnetic field intensity within a temperature range between the room temperature TRT and a predetermined temperature TPB higher than the Curie point Tc2 of the second magnetic film. In reproducing a signal from the magneto-optical recording medium, the medium is heated to the predetermined temperature TPB to interrupt the magnetic coupling between the first and third magnetic film under an application of magnetic field to cause change of domain size in said first magnetic film, thus providing higher resolution of signal and improved S/N to enable high density recording.
584140
Aratani Katsuhisa
Kohno Minoru
Watanabe Kenjiro
Gowling Lafleur Henderson Llp
Sony Corporation
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