Patent
1988-03-16
1990-01-16
Arnold, Bruce Y.
350376, G02F 129
Patent
active
048939102
ABSTRACT:
An information storage system records on a medium with a magneto-optical storage layer and a ferrimagnetic control layer. A higher power write beam is used to impose an upward magnetic orientation and a lower power write beam is used to impose a downward magnetic orientation in the domain. The control layer has an initial downward magnetic orientation, the magnetization of regions of the control layer can be inverted to an upward orientation temporarily while the region is heated above a compensation temperature. The magnetization of the region is restored to its initial downward orientation upon restoration of ambient temperature since neither the higher power nor the lower power write beam heats the control layer to its Curie temperature. The distributed optical and thermal properties of the medium are selected so that, upon heating of the medium by dissipated laser energy, the peak temperature of the control layer occurs after the peak temperature for the storage layer. When the higher power write beam is used, the domain cools through its Curie temperature before the corresponding region cools through its compensation temperature so that an upward magnetic orientation is established in the domain. When the lower power write beam is used, the domain cools through its Curie temperature after the corresponding region cools through its compensation temperature so that a downward magnetic orientation is established in the domain.
REFERENCES:
patent: 3680065 (1972-07-01), Almasi et al.
patent: 3899780 (1975-08-01), Otala
patent: 4649519 (1987-03-01), Sun et al.
Stoffel, A. M., "Thin-Film Magneto-Optic Read-Write Memory Element," IBM Technical Disclosure Bulletin, vol. 12, No. 1, Jun., 1969, pp. 209-210.
T. Nomura, "Recent Trends in Magneto-Optic Disk", Technocrat, vol. 16, No. 3, 3/83.
"Magneto-Optic Recording Erase Method," IBM Technical Disclosure Bulletin, vol. 29, No. 5, 10/86.
"Overwrite System of Magneto-Optical Disk System". Nippon Kogaku, K.K., Information Storage Products Division.
Sheih, H. P. D., and M. H. Kryder, "Magneto-Optic Recording Materials with Direct Overwrite Capability". Applied Physics Letters, vol. 49, No. 8, 8/86.
Sheih, H. P. D., and M. H. Kryder, "Operating Margins for Magneto-Optic Recording Materials with Direct Overwrite Capability". IEEE Transactions of Magnetics, vol. 23, No. 1, 1/87.
Arnold Bruce Y.
Callaghan Terry S.
Hewlett--Packard Company
Howard William H. F.
LandOfFree
Magneto-optical recording system having medium with domainless c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magneto-optical recording system having medium with domainless c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-optical recording system having medium with domainless c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1331562