Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1997-05-30
1998-11-17
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
058386459
ABSTRACT:
A magneto-optical disk provided with a record layer having a recording magnetic domain where data are recorded, an auxiliary reproduction layer for transferring the record data in the record layer to a reproduction layer by generating a floating magnetic field corresponding to the data in the record layer, and the reproduction layer from which the data are read out through irradiation of a light beam, which are sequentially layered while interposing nonmagnetic intermediate layers therebetween. The stable magnetic domain width in the auxiliary reproduction layer is shorter than the recording magnetic domain width at room temperature and extends as the temperature rises and becomes longer at or above a first temperature. The stable magnetic domain width in the reproduction layer is longer than the recording magnetic domain width at room temperature and lessens as the temperature rises and becomes shorter at or above a second temperature which is lower than the first temperature. The first and second temperatures satisfy a condition expressed as: room temperature<second temperature<first temperature.ltorsim.maximum temperature in a light beam spot. Accordingly, a reversed magnetic domain is generated and erased instantaneously in the reproduction layer, and a resulting reproduction signal is a rectangular signal, thereby making it possible to provide a magneto-optical optical recording medium capable of reproducing the high-density record data precisely.
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"MSR Disks with Three Magnetic Layers Using In-Plane Magnetization Films" N. Nishimura, et al. Digest of MORIS '94, No. 29-K-04, p. 125, Sep. 27-29, 1994 Tokyo, Japan.
"Magnetically-induced Super Resolution Using Magneto-Static Coupling", K. Tamanoi, et al., Digest of MORIS '94, No. 29-K-05, p. 126, Sep. 27-29, 1994, tokyo, Japan.
"New Readout Technique Using Domain Collapse on Magnetic Multilayer" H. Miyamoto, et al. Digest of MORIS '94, No. 29-K-06, p. 127, Sep. 27-29, 1994, Tokyo Japan.
Hirokane Junji
Mieda Michinobu
Nakayama Junichiro
Takahashi Akira
Conlin David G.
Daley, Jr. William J.
Dinh Tan
Sharp Kabushiki Kaisha
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