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:
Jun. 18, 1996
Filed:
Apr. 07, 1994
Karl-Friedrich Doessel, Wiesbaden, DE;
Bernd Fischer, Wiesbaden-Nordenstadt, DE;
Ernst G Schlosser, Kelkheim, DE;
Guenther Schmidt, Niedernhausen, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A magnetooptic layer made from rare-earth metals and transition metals exhibits a gradient in the alloy composition over the layer depth, and has a coercive field strength of more than 8 kOe in the temperature range of .DELTA.T=100.degree. C. around the compensation temperature T.sub.comp. The layer is fabricated with a dynamic sputter process, in which the substrates to be coated are led past one or a plurality of sputter targets, arranged in a common plane parallel to the track of the substrates. A mask is located between the sputter targets and the substrates.