Magneto-optical recording medium with a layer to enlarge magneti

Details Magneto-optical recording medium with a layer to enlarge magneti Magneto-optical recording medium with a layer to enlarge magneti

1998-04-10

2000-02-29

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369283, 369288, 3692752, 428694MM, 428694EC, G11B 1110

Patent

active

060317930

ABSTRACT:
In reading a magneto-optical recording medium comprising a substrate and a magnetic multilayer on a surface of the substrate, which multilayer comprises, in order from the surface of the substrate, an amplifying layer A.sub.1, a control layer C.sub.2, and a recording layer R.sub.3 with a magnetic domain formed therein, the medium is first irradiated with a laser beam while a reading magnetic field is applied thereto in one direction. With the resulting temperature increase, the magnetic domain in R.sub.3 is successively copied from C.sub.2 to A.sub.1 to form copied magnetic domains, which are in turn enlarged by a reading magnetic field. Then, the enlarged, copied magnetic domain in A.sub.1 is read out. Thereupon, laser beam irradiation is interrupted or the power of the laser beam is decreased to thereby vanish the copied magnetic domains in A.sub.1 and C.sub.2. To carry out reading by light intensity modulation, an interface wall exchange force magnetic field between the respective magnetic layer, etc. is controlled, so that reading can take place with no application of a modulated magnetic field.

REFERENCES:
patent: 5210724 (1993-05-01), Kobayashi
patent: 5218581 (1993-06-01), Ohta et al.
patent: 5864520 (1999-01-01), Fukamachi et al.
patent: 5879822 (1999-03-01), Okada

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