Double-layered magnetooptical recording medium

Details Double-layered magnetooptical recording medium Double-layered magnetooptical recording medium

1985-03-26

1988-06-28

Lesmes, George F.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428681, 428686, 428694, 428900, G11B 724

Patent

active

047538538

ABSTRACT:
A double-layered magnetooptical recording medium consists of two exchange-coupled layers that permit perpendicular magnetization, one layer having a low Curie point and a high coercive force and the other layer having a high Curie point and a low coercive force. The layer having low coercive force is made of a transition metal rich amporphous Gd.sub.U (Fe.sub.V Co.sub.100-V).sub.100-U alloy having the following compositional range, and the layer having high coercive force is made of a transition metal rich amorphous Tb.sub.W Fe.sub.100-W alloy having the following compositional range:

REFERENCES:
patent: 4518657 (1985-05-01), Yanagida
patent: 4556291 (1985-12-01), Chen
patent: 4569881 (1986-02-01), Freese et al.
Taylor et al; "Magnetic Anisotrophy in Evaporated Amorphons Films of the Ternary System Gd.sub.x (Fe.sub.1-y Co.sub.y).sub.1-x Journal of Applied Physics vol. 48(1) 1977 p. 358.

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