Magneto-optical recording medium having a reproducing layer with

Details Magneto-optical recording medium having a reproducing layer with Magneto-optical recording medium having a reproducing layer with

1996-07-24

1998-10-20

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

428694EC, G11B 1100

Patent

active

058257233

ABSTRACT:
A non-magnetic intermediate layer for intercepting magnetic exchange interaction is provided between a recording layer and a reproducing layer which are composed of a magnetic thin film with perpendicular magnetization. At this time, the reproducing layer is formed so that when an external magnetic field is applied thereto in reproducing information, its magnetization direction is arranged in the direction of the external magnetic field in a first temperature range, and when a light beam for reproduction is projected thereto and the reproducing layer is in a second temperature, the magnetization direction is arranged in the direction of a leakage magnetic flux generated from the recording layer, and is again arranged in the direction of the external magnetic field in a third temperature range. As a result, a rise and a fall of a reproducing signal detected from the reproducing layer can be made sharp, thereby achieving recording and reproducing at high density.

REFERENCES:
patent: 5640374 (1997-06-01), Hirokane et al.
patent: 5648162 (1997-07-01), Hirokane et al.
patent: 5659537 (1997-08-01), Hirokane 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).

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