Magneto-optical recording device using light-modulated technic w

Details Magneto-optical recording device using light-modulated technic w Magneto-optical recording device using light-modulated technic w

1996-11-06

1997-11-25

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

056919638

ABSTRACT:
A magneto-optical recording medium including a base; a readout layer formed on the base; a recording layer formed on the readout layer; and an auxiliary recording layer formed on the recording layer, each of the readout layer, recording layer and auxiliary recording layer being made of an alloy of rare-earth metal and transition metal showing ferrimagnetism. The alloy composition of each layer is determined so that the recording layer has a Curie temperature lower than Curie temperatures of the readout layer and the auxiliary recording layer and has a coercive force higher than coercive forces of the readout layer and the auxiliary recording layer at room temperature and that, when the temperature of the recording layer is raised to near its Curie temperature while perpendicularly applying a uniform recording magnetic field to each layer, a sublattice magnetic moment of the rare-earth metal of the readout layer and a sublattice magnetic moment of the rare-earth metal of the auxiliary recording layer are antiparallel to each other. And, a method of recording information on the magneto-optical recording medium. This structure enables overwriting by light-intensity modulation without using an initializing magnetic field.

REFERENCES:
patent: 5278810 (1994-01-01), Takahashi et al.
patent: 5428585 (1995-06-01), Hirokane et al.
patent: 5428586 (1995-06-01), Kobayashi et al.

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