Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1994-12-29
1997-01-14
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428 643, 428336, 428694SC, 428694DE, 428694RE, 428694RL, 428694MM, 428694EC, 428694NF, 428900, 369 13, 369283, 369286, 360 59, 360114, G11B 566
Patent
active
055937900
ABSTRACT:
A magneto-optic recording medium having two magneto-optic layers exchange-coupled to each other. The Curie temperature, T.sub.C1, of the first layer is less than that of the second layer, T.sub.C2. The magneto-optic effect is large for temperatures, T, less than T.sub.C1, but the thicknesses of the two layers are selected so that they optically interfere to result in zero magneto-optic rotation at temperatures between T.sub.C1 and T.sub.C2. The medium is designed so that a laser beam detects a signal only at the front of the beam spot and not at the rear of the spot, allowing a drive system to read/write smaller bits on the medium, thereby increasing the storage capacity of the medium.
REFERENCES:
patent: 4871614 (1989-10-01), Kobayashi
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5265074 (1993-11-01), Ohta et al.
"Multilayered Magneto-Optical Disks for Magnetically Induced Superresolution,"Kaneko et al., Jpn. J. Appl. Phys., vol. 31 (1992), pp. 568-575.
Imation Corp.
Kiliman Leszek
Levinson Eric D.
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