Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1990-07-12

1991-07-09

Cashion, Jr., Merrell C.

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Web or sheet containing structurally defined element or...

Physical dimension specified

428694, 428900, G11B 724

Patent

active

050305123

ABSTRACT:
A first and a second magnetic layer are deposited on a substrate. The first magnetic layer has high magneto-optical effect at short wavelengths, but low perpendicular anisotropy. The second magnetic layer has low magneto-optical effect at short wavelengths, but high perpendicular anisotropy. The magnetic exchange coupling between the two magnetic layers results in a recording medium which has strong perpendicular anisotropy and high magneto-optical effect, even at short wavelengths.

REFERENCES:
patent: 4814053 (1989-03-01), Shimokawato
patent: 4838962 (1989-06-01), Takayama et al.
"Photomagnetic Recording Medium for Compensation Point Writing" Kogyo & Kimura, 5/9/85, 48 P 423.
"Magneto-Optical Properties of Nd-Co & Nd-Fe Alloys" McGuire et al., J. Appl. Physics, 61(8), Apr. 15, 1987.
"Exchange Coupled Magneto-Optic Layers" Gambino et al., IEEE Transactions on Magnetics, vol. 24, No. 6, Nov. 1988.

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