Method of recording bivalent signals on opto-magnetic record med

Details Method of recording bivalent signals on opto-magnetic record med Method of recording bivalent signals on opto-magnetic record med

1988-09-08

1990-05-15

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

365122, 360 59, G11B 1112, G11B 1304

Patent

active

049264028

ABSTRACT:
In a method of recording, in the over-write mode, bivalent signals "0" and "1" on an opto-magnetic record medium having a ferrimagnetic material whose compensation temperature is higher than a room temperature, but is lower than a Curie temperature, an external magnetic field is applied to the record medium, and a laser light beam is modulated in accordance with the bivalent signals. When the bivalent signal "0" is to be recorded, the laser light beam is set to a lower power level and the ferrimagnetic material of the record medium is heated to a temperature higher than the room temperature, but lower than the compensation temperature so that the ferrimagnetic material is magnetized in the same direction as the external magnetic field. When the bivalent signal "1" is to be recorded, the laser light beam is changed into a high power level and the ferrimagnetic material is heated above the Curie temperature so that the ferrimagnetic material is magnetized in the direction opposite to that of the external magnetic field.

REFERENCES:
patent: 4858212 (1989-08-01), Takahashi et al.
Krumme et al, "New Magneto-Optic Mem. Concept Based on Compensation Wall Domains", Appl. Phys. Lett., vol. 23, No. 10 (11/10/73), pp. 576-578.
Electronics, "Mag. Op. Mem. Begin to Look Like a Good Bet-Simple Nikon Tech. Permits Erase and Write in One Pass" Electronics, Apr. 16, 1987.

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