The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1997
Filed:
Dec. 29, 1994
Andrew D Dubner, St. Paul, MN (US);
Imation Corp., St. Paul, MN (US);
Abstract
A magneto-optic recording medium having two magneto-optic layers exchange-coupled to each other. The Curie temperature, T.sub.C1, of the first layer is less than that of the second layer, T.sub.C2. The magneto-optic effect is large for temperatures, T, less than T.sub.C1, but the thicknesses of the two layers are selected so that they optically interfere to result in zero magneto-optic rotation at temperatures between T.sub.C1 and T.sub.C2. The medium is designed so that a laser beam detects a signal only at the front of the beam spot and not at the rear of the spot, allowing a drive system to read/write smaller bits on the medium, thereby increasing the storage capacity of the medium.