International Business Machines Corporation

John G Eckhardt

Michael M Farrow

James Carr Suits

Chien-Jung F Lin

An optical data storage medium is comprised of a data layer and a reference layer deposited onto a substrate. The data layer material is comprised of a transition metal rich rare earth-transition metal. The data layer has a destruction temperature greater than its Curie temperature. The reference layer is comprised of a transition metal poor rare earth-transition metal. The reference layer material has a Curie temperature greater than the destruction temperature of the data layer material. The result is a magneto-optic medium which may be recorded upon only once.

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Morgan Hill, CA, United States of America

John G Eckhardt