Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1994-12-15
1997-06-10
Kiliman, Leszek
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428336, 428694ML, 428694RE, 428694MM, 428694EC, 428900, 427127, 427130, 427131, 369 13, 369283, 369286, G11B 566
Patent
active
056373945
ABSTRACT:
A magneto-optical recording medium comprising a readout layer and a recording layer has a relationship that an external magnetic field H1 is smaller than an external magnetic field H4, where the H1 is a minimum external magnetic field necessary to make a magnetization direction of the readout layer direct to the direction reverse to a magnetization direction of the recording layer substantially at the room temperature, and the H4 is a maximum external magnetic field necessary to make the magnetization direction of the readout layer direct to the direction same as the magnetization direction of the recording layer at an high temperature not lower than a predetermined temperature. Moreover, the magneto-optical disk is provided, between the readout layer and the recording layer, with an intermediate layer which inhibits an effective bias magnetic field from the recording layer to the readout layer at the room temperature. Since it is possible to reproduce only the information in the high-temperature area close to the center of the laser beam irradiated during reproducing, recording density is improved. Furthermore, since an initializing magnetic field at reproducing is not necessary and the reproducing magnetic field can be made smaller, the apparatus can be made smaller and the electric power consumption can be decreased.
REFERENCES:
Murakami, "Super resolution Feedout of Magneto-optical Disk with an in-phase Magnetization Layer" J. Magn. Soc. Jpn., vol. 17, Supplement No. 51 (1993), pp. 201-204.
M. Kaneko, et al., "Multilayered Magneto-Optical Disks for Magnetically Induced Supperresolution," Jpn. J. Appl. Phys., vol. 31 (1992) pp. 568-575, Part 1, No. 2B, Feb. 1992.
Y. Murakami, et al., "Super Resolution Readout of a Magneto-Optical Disk with an In-Plane Magnetization Layer," J. Magn. Soc. Jpn., Proceeding of Magneto-Optical Recording International Symposium '92, vol. 17, Supplement No. S1 (1993), pp. 201-204.
K. Aratani, et al., "Magnetically Induced Super Resolution in Novel Magneto-Optical Disk," ODS 1991, TuB3-1,3 pp. 112-115.
J. Nakajima et al, "Magneto-Optical Recording International Symposium," Magneto-Optical Recording International Symposium Post Dead Line Papers Technical Digest, Sep. 29, 1994.
Iketani Naoyasu
Katayama Hiroyuki
Murakami Yoshiteru
Nakajima Junsaku
Ohta Kenji
Conlin David G.
Kiliman Leszek
Michaelis Brian L.
Sharp Kabushiki Kaisha
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