Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-06-02
1997-08-19
Edun, Muhammad N.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369100, 369 13, G11B 700
Patent
active
056595379
ABSTRACT:
A recording layer including a recording magnetic domain for recording thereon information is formed. A reproducing layer for reproducing information by projecting thereto a light beam is formed on the recording layer. A non-magnetic intermediate layer for intercepting a magnetic exchange coupling force exerted between the recording layer and the reproducing layer is formed between the recording layer and the reproducing layer. The reproducing layer is arranged such that the width of the stable magnetic domain on the reproducing layer at room temperature is larger than the width of the recording magnetic domain in the recording layer. At a reproducing temperature by the light beam, the width of the stable magnetic domain becomes smaller than the width of the recording magnetic domain, and the information is copied by the leakage magnetic flux of the recording magnetic domain. Depending on whether or not the information transferred to the reproducing layer is reproduced, the effects from other magnetic domain adjacent to the magnetic domain to be reproduced from the reproducing layer can be prevented, thereby enabling a high density recording of information on the recording layer.
REFERENCES:
patent: 5278810 (1994-01-01), Takahashi et al.
"MSR Disks with Three Magnetic Layers using In-Plane Magnetization Films" (N. Nishimura et al., The MORIS '94, 29-K-04, p. 125.
"Magnetically-Induced Super Resolution using Magneto-Static Coupling" (K. Tamanoi et al., The MORIS '94, 29-K-05, p. 126).
"New Readout Technique using Domain Collapse on Magnetic Multilayer" H. Miyamoto, et al., The MORIS '94, 29-K-06, p. 127).
Hirokane Junji
Mieda Michinobu
Nakayama Junichiro
Takahashi Akira
Conlin David G.
Edun Muhammad N.
Michaelis Brian L.
Sharp Kabushiki Kaisha
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