Optical device and manufacturing method thereof

Details Optical device and manufacturing method thereof Optical device and manufacturing method thereof

1998-10-13

2000-04-11

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428694ML, 428694XS, 428694MM, 428913, 43027012, 4304951, 430945, 369283, 369288, B32B 300

Patent

active

060485973

ABSTRACT:
An optical disc in which a desired exchange reciprocal action is displayed between two sorts of the rare earth-transition metal alloy films to realize optimum recording/reproducing characteristics, and a manufacturing method for the optical disc. To this end, an optical disc 1 includes a first rare earth-transition metal alloy film containing rare earth elements and transition elements and a second rare earth-transition metal alloy film layered on the first rare earth-transition metal alloy film. The second rare earth-transition metal alloy film has a composition different from that of the first rare earth-transition metal alloy film and contains rare earth elements and transition elements. An oxidized area defined between the first rare earth-transition metal alloy film and the second rare earth-transition metal alloy film has an oxygen content not higher than 2.5 atom % and a thickness not larger than 7 nm.

REFERENCES:
patent: 5577020 (1996-11-01), Utsunomiya
patent: 5585197 (1996-12-01), Ikeda
patent: 5822282 (1998-10-01), Nakayama
patent: 5876858 (1999-03-01), Ikeya
patent: 5889740 (1999-03-01), Nqakayama
patent: 5982713 (1999-11-01), Nakayama

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