Magneto-optical recording medium having two reproduction layers

Details Magneto-optical recording medium having two reproduction layers Magneto-optical recording medium having two reproduction layers

1996-01-03

1997-05-27

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, G11B 1100

Patent

active

056338384

ABSTRACT:
A non-magnetic intermediate layer is provided between a reproductive layer and a recording layer. The reproductive layer is composed of a first reproductive layer and a second reproductive layer. When the first reproductive layer has a temperature that is higher than a first critical temperature, its stable magnetic domain width becomes smaller than a recording magnetic domain width so that the magnetization is reversed. When the second reproductive layer has a temperature that is higher than a second critical temperature, its stable magnetic domain width becomes larger than the recording magnetic domain width so that the reversed magnetic domain is collapsed. The first critical temperature is lower than the second critical temperature. A reproductive output having abrupt rising and falling can be obtained by the generation and the collapse of the reverse magnetic domain on the reproductive layer. For this reason, higher density recording required for larger capacity can be achieved.

REFERENCES:
patent: 5329512 (1994-07-01), Fukumoto et al.
patent: 5390162 (1995-02-01), Fukumoto et al.
patent: 5432774 (1995-07-01), Fukumoto et al.
N. Nishimura et al., MSR Disks with Three Magnetic Layers Using In-Plane Magnetization Films, Digest of Moris '94, No. 29-K-04, p. 125, Sep. 29, 1994.
K. Tamanoi et al., Magnetically-Induced Super Resolution Using Magneto-Static Coupling, Digest of Moris '94, No. 29-K-05, p. 126, Sep. 29, 1994.
H. Miyamoto et al., New Readout Technique Using Domain Collapse on Magnetic Multilayer, Digest of Moris '94, No. 29-K-06, p. 127 Sep. 29, 1994.

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