Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Reexamination Certificate
2004-02-13
2008-09-09
McDonald, Rodney G (Department: 1795)
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
C369S013520, C369S013500, C369S013470, C369S013460, C369S013450, C369S013420, C369S013410, C369S013400, C369S013380, C369S013240, C204S192200, C427S130000
Reexamination Certificate
active
07423939
ABSTRACT:
A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided. The method is to manufacture a magneto-optical recording medium in which on a substrate1having grooves12at least a reproduction layer and a recording layer, each of which is formed of magnetic layers, are deposited and recorded information is reproduced through domain wall displacement in the reproduction layer; and the method includes a first annealing process in which, after depositing at least the reproduction layer and recording layer on the substrate1on which are formed lands11and grooves12, only side-wall portions13between adjacent lands11and grooves12are irradiated with laser light L1, and a second magnetization annealing process in which regions including adjacent side-wall portions13and lands between side-wall portions13are irradiated with laser light L2having a spot diameter greater than the spot diameter of the laser light in the first annealing process, while applying an external magnetic field Hex.
REFERENCES:
patent: 6716489 (2004-04-01), Miyaoka
patent: 6767697 (2004-07-01), Uchida et al.
patent: 2004/0076083 (2004-04-01), Nishikawa et al.
patent: 06-290496 (1994-10-01), None
patent: 08-147777 (1996-06-01), None
Fujiie Kazuhiko
Fujita Goro
Miki Takeshi
Sakamoto Tetsuhiro
Tanaka Yasuhito
Depke Robert J.
McDonald Rodney G
Rockey, Depke & Lyons LLC.
Sony Corporation
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