Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-03-11
1992-06-30
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1304, G11B 1110, G11B 1112
Patent
active
051269864
ABSTRACT:
A multi-layered magnetooptical recording medium that satisfies predetermined formulas is over write capable when used, in a recording method and apparatus, with a jointing field, i.e., a magnetic field the intensity of which decreases continuously from an initial field to a bias field having the same direction as the initial field, permitting greater freedom in the choice of media compositions. In a two-layer structure including magnetically coupled recording and reference layers, recorded data may advantageously be reproduced from the reference layer.
REFERENCES:
patent: 4660190 (1987-04-01), Fujii et al.
patent: 4672594 (1987-06-01), Kato et al.
patent: 4855975 (1989-08-01), Akasaka et al.
Matsumoto Hiroyuki
Saito Jun
Sato Masatoshi
Levy Stuart S.
Nguyen Hoa
Nikon Corporation
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