Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1993-07-16
1995-10-17
Thibodeau, Paul J.
Stock material or miscellaneous articles
Composite
Of inorganic material
428694MM, 428611, 428615, 428655, 428668, 428681, 428900, 360 59, 360114, 385122, 369 13, 3692752, 3692753, 430945, G11B 566
Patent
active
054589878
ABSTRACT:
A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.
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Kobayashi et al. "Magnetization of Exchange-Coupled Ferrimagnetic Double-Layered Films"; Jap. J. Appl. Phys. vol. 20, No. 11; Nov., 1981 pp. 2089-2095.
Akasaka Hideki
Saito Jun
Sato Masatoshi
Follett R.
Nikon Corporation
Thibodeau Paul J.
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