Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1999-04-27
2000-11-21
Pianalto, Bernard
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
427131, 427132, 428639, 428641, 428642, 428651, 428653, 428654, 428662, 428667, 428668, 428670, 428675, 428676, 428694RE, 428694XS, 428694NF, 428694EC, 428694TP, 428694TM, 428698, 428699, 428701, 428702, 428704, 428900, 428928, B32B 1518, B32B 900, B32B 904, G11B 566, H01F 100
Patent
active
061500380
ABSTRACT:
A reproducing layer, an intermediate layer, and a recording layer are successively stacked. The reproducing layer is made of a perpendicularly magnetized film whose domain wall coercivity is relatively smaller and whose domain wall mobility is relatively larger as compared with the recording layer around a reproducing temperature. When the reproducing layer, the intermediate layer, and the recording layer have Curie temperatures of Tc1, Tc2, and Tc3, Tc1, Tc2, and Tc3 satisfy a relationship of Tc2<Tc1<Tc3. Upon reproducing information, the reproducing layer is partially heated to more than the Curie temperature by irradiating with a light beam. This arrangement makes it possible to expand and reproduce a domain without causing a repetition of reproduction and to reproduce a signal having a period which is not more than an optical diffraction limit without reducing an amplitude of the reproduced signal, thereby dramatically improving a recording density.
REFERENCES:
"High-Density Magneto-Optical Recording with Domain Wall Displacement Detection", T. Shiratori, et al., Joint Magneto-Optical Recording International Symposium/International Symposium on Optical Memory, 1997, Techical Digest, TU-E-04, pp. 38-39. (No Month Avail.).
Hirokane Junji
Iwata Noboru
Conlin David G.
Pianalto Bernard
Sharp Kabushiki Kaisha
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