Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1997-02-19
1999-05-04
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
428694ML, G11B 1100
Patent
active
059011181
ABSTRACT:
A magneto-optical recording medium having a substrate whereupon a transparent dielectric layer, a readout layer showing in-plane magnetization at room temperature and perpendicular magnetization with an increase in temperature, a metal film layer, a recording layer made of a perpendicularly magnetized film, and a protective layer are formed in this order, wherein the film thickness of the readout layer is between 5 nm and 30 nm, the film thickness of the metal film layer is between 6 nm and 40 nm, and the film thickness of the recording layer is between 20 nm and 80 nm. Since recording domain information at a portion showing in-plane magnetization is masked, even when adjacent recording bit enters into the beam diameter of a light beam focused, it is possible to separately reproduce individual recording bits with high signal quality.
REFERENCES:
patent: 5633838 (1997-05-01), Hirokane et al.
patent: 5640374 (1997-06-01), Hirokane et al.
patent: 5648162 (1997-07-01), Hirokane et al.
patent: 5659537 (1997-08-01), Hirokane et al.
Hirokane, J., Takahashi, A. Magnetically Induced Super-resolution Magneto-optical Disk with Interferential Structure. The Japan Society of Applied Physics and Related Societies, No. 3, 1996, 26-29.
Hirokane Junji
Iketani Naoyasu
Murakami Yoshiteru
Takahashi Akira
Conlin David G.
Dinh Tan
Neuner George W.
Sharp Kabushiki Kaisha
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