Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1997-11-20
1999-10-05
Kiliman, Leszek
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428694ML, 428694SC, 428694MT, 428694RE, 428694NF, 428694MM, 428694EC, 428900, 428332, 369 13, 369283, 369284, 369286, G11B 566
Patent
active
059621265
ABSTRACT:
The invention features an apparatus and method for reproducing recorded bits from a magneto-optical recording medium. The medium includes a base, a readout layer formed on the base, a transfer layer formed on the readout layer and a recording layer formed on the transfer layer. The readout and recording layers each exhibit perpendicular magnetization in a temperature range between room temperature and, respectively, the readout layer's Curie temperature and the recording layer's Curie temperature. The transfer layer is predominant in-plane magnetization at room temperature and an in-plane to perpendicular magnetization transition occurs at a temperature above room temperature. Also, the recording layer Curie temperature is lower than the Curie temperature of the transfer layer. The reproducing method includes the steps of projecting a light beam, applying a subsidiary magnetic field and reproducing information based on reflected light from the readout layer while applying the subsidiary magnetic field. The light beam is projected onto the readout layer from the side of the base so the in-plane to perpendicular magnetization transition occurs in a portion of the transfer layer, the portion corresponding to a central portion of the light beam spot. The intensity of the subsidiary magnetic field is higher than the coercive force of the readout layer and less than the exchange coupling force exerted from the recording-layer and the transfer layer to the readout layer.
REFERENCES:
"Super Resolution in Magneto-Optical Disks" (M. Kaneko et al., Magazine of Japan Applied Magnetic Society, vol. 15, No. 5, 1991, pp. 838-844).
"Read Out Mechanism of Magnetically Induced Super Resolution" (M. Ohto et al., Proceedings of Magneto-Optical Recording International Symposium '91, J. Magn. Soc. pn., vol. 15, Supplement No. S1 (1991), pp. 319-322).
Katayama Hiroyuki
Mieda Michinobu
Ohta Kenji
Takahashi Akira
Conlin David G.
Daley, Jr. William J.
Kiliman Leszek
Sharp Kabushiki Kaisha
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