Over write capable magnetooptical recording method using two bea

Details Over write capable magnetooptical recording method using two bea Over write capable magnetooptical recording method using two bea

1987-10-05

1989-08-08

Faber, Alan

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 1112

Patent

active

048559750

ABSTRACT:
A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating two adjacent laser beams, i.e., a leading beam and a trailing beam onto the medium; the leading beam being an erasing beam of low level which is not modulated in principle; the trailing beam is a writing beam which is pulse modulated between high level and basis level in accordance with binary data to be recorded; and the basis level being able to have an intensity equal to or lower than the low level and to be zero level; when the trailing laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization, and when the leading low-level laser beam is radiated, forming the other bit.

REFERENCES:
patent: 4610009 (1986-09-01), Connell
patent: 4612587 (1986-09-01), Kaneko et al.
patent: 4649519 (1987-03-01), Sun et al.
patent: 4672594 (1987-06-01), Kato et al.
patent: 4794560 (1988-12-01), Bell et al.
Tanaka, The Japanese Patent Abstract, vol. 6, No. 34 (p. 104) (912), Mar. 12, 1982.
Yamada et al, "Erasable Optical Disc Using TeO.sub.x Thin Film", Proceedings of Japan Display '83, pp. 40-48.
Nikon, "Magneto-Optic Memories Begin to Look Like a Good Bet", Electronics, Apr. 16, 1987, p. 33.
Mizutani, The Japanese Patent Abstract, vol. 9, No. 86, Apr. 16, 1985.
Kobayashi et al, "Mag. Process of Exchange-Coupled Ferrimagnetic Double-Layered Films", Japanese Journal of Applied Physics, vol. 20, No. 11, Nov. 1981, pp. 2089-2095.
R. G. Swartz et al, "Stabilized Biasing of Semiconductor Lasers", The Bell System Technical Journal, vol. 62, No. 7, Part 1, Sep. 1983, pp. 1923-1936.

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