Over write capable magnetooptical recording method, and magnetoo

Details Over write capable magnetooptical recording method, and magnetoo Over write capable magnetooptical recording method, and magnetoo

1993-07-16

1994-11-22

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 1304

Patent

active

053675070

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 a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the 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 that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.

REFERENCES:
patent: 4539662 (1985-09-01), Hatano et al.
patent: 4908809 (1990-03-01), Takokoro et al.
patent: 4955007 (1990-09-01), Aratani et al.
patent: 5016232 (1991-05-01), Takokoro et al.
patent: 5025430 (1991-06-01), Takokoro et al.

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