Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1995-01-03

1998-07-28

Kiliman, PHD, Leszek

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Physical dimension specified

428336, 428694DE, 428694NF, 428694XS, 428694RL, 428694MM, 428694PR, 428694EC, 428 643, 428 646, 428900, 369 13, 369272, 3692752, 3692755, 368283, 368286, G11B 566, G11B 1100

Patent

active

057860785

ABSTRACT:
A magneto-optical recording medium comprising a transparent substrate, a first dielectric layer on the substrate, a magneto-optical recording layer on the first dielectric layer and a metal reflecting layer on the magneto-optical recording layer, optically with a second dielecric layer between the magneto-optical recording layer, wherein the magneto-optical recording layer has a Curie temperature Tc of from 100.degree. C. to 200.degree. C. and a layer thickness of from 15 nm to 60 nm, the metal reflecting layer has a layer thickness of not less than 60 nm and a product .lambda.d of a thermal conductivity .lambda. by the layer thickness d of from 2.5 .mu.W/K to 20 .mu.W/K, and the following formula is satisfied: Tc.ltoreq.-10.times..lambda.d+300. This magneto-optical recording medium has an improved stability under repeated recording and erasing, or continuous erasing, operations without a loss of a high recording sensitivity thereof.

REFERENCES:
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patent: 5058099 (1991-10-01), Murakami et al.
patent: 5093174 (1992-03-01), Suzuki et al.
F.E. Luborsky, et al. "Stability of Amorphous Transition Metal-Rape Earth Films For Magnet-Optic Recording", IEEE Transactions on Magnetics, vol.Mag-21, No. 5, Sep. 1985, pp.1618-1623.
M.Birukawa et al. "Repeat Reading Stability in Magnet-optical Media", Optical Memory Symposium '90, Jul. 11. pp.65-66.

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