Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1993-03-24
1996-03-26
Nguyen, Hoa T.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, G11B 1304, G11B 1112
Patent
active
055026923
ABSTRACT:
There are provided magnetooptic recording and reproducing method and apparatus of the Curie point writing type in which recording information can be read out by using a magnetic Kerr effect and the overwriting can be performed. At a position away from a laser irradiating section of a magnetooptic recording disk having first to third magnetic layers, there is applied a predetermined magnetic field which can magnetize the third magnetic layer in a uniform perpendicular direction and can magnetize the second magnetic layer in a uniform in-surface direction. Then, a recording bias magnetic field is applied to the laser irradiating section of the disk and a laser beam of a power such as to raise the temperature of the disk to a value near the Curie point of the first magnetic layer is simultaneously irradiated in accordance with a recording signal, thereby orienting the magnetizing direction of the first magnetic layer to a stable direction for the third magnetic layer without changing the magnetizing direction thereof. Or, a recording bias magnetic field is applied to the laser irradiating section of the disk and only a laser power so as to raise the temperature of the disk to a value near the Curie point of the third magnetic layer is simultaneously irradiated, thereby reversing the magnetizing direction of the third magnetic layer and magnetizing the first magnetic layer to a stable direction for the third magnetic layer.
REFERENCES:
patent: 4059828 (1977-11-01), Kobayashi et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4908809 (1990-03-01), Tadokoro et al.
patent: 4955007 (1990-09-01), Aratani et al.
Electronics, "Simple Nikon Technique permits erase and write in one pass", Electronics/Apr. 16, 1987, p. 33.
Canon Kabushiki Kaisha
Nguyen Hoa T.
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