Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1994-07-21
1996-12-31
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694DE, 428694SC, 428694XS, 428694NF, 428694RL, 428694EC, 428694MM, 428336, 428900, 369 13, 369272, 369283, 369286, G11B 566
Patent
active
055892825
ABSTRACT:
Disclosed is a magneto-optical recording medium capable of high-density recording with low noise level and a high readout signal level. The recording medium of the invention consists of a transparent substrate 11, with a first dielectric layer 12, a reading layer 13, a writing layer 14, a second dielectric layer 15 and a reflective layer 16 being laminated successively thereon in this order, in which the film thickness of the second dielectric layer is greater than that of the first dielectric layer. The magnetic characteristics of each magnetic layer is designed to be such that the magnetization can be transcribed from the writing layer to the reading layer, and that neat marks can be formed in the reading layer by the transcription of the magnetization to realize low noise level. While the thickness of each magnetic lays is 20 nm or more, the total film thickness of the recording layer is 40 nm or more and less than 80 nm. Accordingly, a high readout signal level can be realized by utilizing the optical enhancement under control of reduction in the reflectivity.
REFERENCES:
patent: 4628485 (1986-12-01), Tanaka et al.
patent: 5265073 (1993-11-01), Osato
"Recording Sensitivity and Lifetime Estimate of a Magneto-Optical Disk", by H. Katayama et al., Journal of Appl. Mag. Soc. Japan vol. 11, No. 2, 1987 pp. 213-216.
Ohta et al, Proceedings--Optical Data Storage, "Magneto-optical disk with reflecting layers", SPIE vol. 382, pp. 252-259, Jan. 17-20 1983.
Kiliman Leszek
NEC Corporation
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