Magneto-optical recording apparatus for creating magnetic domain

Details Magneto-optical recording apparatus for creating magnetic domain Magneto-optical recording apparatus for creating magnetic domain

1990-11-07

1992-12-08

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

G11B 1304, G11B 1110, G11B 1112

Patent

active

051703823

ABSTRACT:
A magneto-optical recording apparatus records an information signal on a disk by illuminating a magnetic layer on the disk with a pulsed laser beam having a frequency at least twice the maximum frequency of the information signal, and applying a magnetic field with a polarity switched according to the information signal to the spot illuminated by the laser beam. To ensure erasure of old information, the apparatus can modify the peak power level, bottom power level, duty cycle, or frequency of the pulsed laser beam according to the radial position of the beam on the disk.

REFERENCES:
patent: 4426693 (1984-01-01), Satoh et al.
patent: 4807210 (1989-02-01), Kaku et al.
patent: 4949329 (1990-08-01), Furman et al.
patent: 5014254 (1991-05-01), Van Rosmalen et al.
"A Magneto-Optical Recording Method of Magnetic Field Mudulation with Pulse Radiated Laser," Fujita et al., ISOM '89 Technical digest, 28D-3, pp. 179-180 1989.
"Magneto-Optical Recording Characteristics of TbFeCo Media by Magnetic Field Modulation Method," Tanaka et al., Japanese Journal of Aplied Physics, vol. 26, No. 2, (1987) pp. 231-235.

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