Magnetooptical recording method, and apparatus used in the metho

Details Magnetooptical recording method, and apparatus used in the metho Magnetooptical recording method, and apparatus used in the metho

1991-06-10

1993-08-10

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365 10, 365 32, 365122, G11B 1304

Patent

active

052355691

ABSTRACT:
A method of this invention is a non-overwritable method of recording information on a magnetooptical recording medium in which at least two layers including a first layer comprising a magnetic thin film having a perpendicular magnetic anisotropy, and a second layer comprising a magnetic thin film having a perpendicular magnetic anisotropy, and having a Curie temperature higher than or almost equal to a Curie temperature of the first layer are stacked to be exchange-coupled to each other, and a direction of magnetization of only the second layer can be aligned in a predetermined direction by a first external field at a room temperature while a direction of magnetization of the first layer is left unchanged. The medium which has already been set in a state wherein the direction of magnetization of the second layer is aligned in the predetermined direction, and a interface magnetic wall is formed between the first and second layers is prepared. A beam is radiated on the prepared medium while rotating the medium. The beam is pulse-modulated according to information to be recorded between a first intensity level for giving, to the medium, a temperature lower than the Curie temperature T.sub.C1 of the first layer, and higher than or equal to a lowest temperature T.sub.LS for causing the interface magnetic wall between the first and second layers to disappear, and a second intensity level for giving, to the medium, a temperature lower than the temperature T.sub.LS. In another aspect of this invention, the first intensity level is set at a level for giving, to the medium, a temperature equal to or higher than T.sub.C1 and lower than the Curie temperature T.sub.C2 of the second layer.

REFERENCES:
patent: 4198692 (1980-04-01), Kabayashi
patent: 4910622 (1990-03-01), Saito et al.
patent: 4955007 (1990-09-01), Aratani et al.
Patent Abstracts of Japan, vol. 12, No. 488, Dec. 20, 1988, p. 84 P 803, Kokai No. 63-200343.

Affiliated with

Also associated with

Rating

Magnetooptical recording method, and apparatus used in the metho does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetooptical recording method, and apparatus used in the metho, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetooptical recording method, and apparatus used in the metho will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1731276