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:
Aug. 17, 1993
Filed:
Mar. 27, 1992
Boris J Muchnik, Boulder, CO (US);
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A magneto-optic recording structure is disclosed in which the magnetic recording layer is sandwiched between an opaque substrate and a magneto-optic layer structure. The magneto-optic recording structure comprises a substrate, a magnetic recording layer coated on the substrate and a magneto-optic layer structure coated on the magnetic recording layer. The arrangement of layers permits both the magnetic and magneto-optic layers to be addressed from the same side. The magnetic recording layer and the magneto-optic layer structure can be coated on both sides of the substrate, to make double-sided disks. The recording structure also allows the use of opaque substrates. An information recording and playback device based on the magneto-optic recording structure comprises a magnetic recording head disposed adjacent the magneto-optic layer adjacent the magneto-optic layer structure for recording and reading the magneto-optic active layer. A method for recording data on the magneto-optic layer. A method for recording data on the magneto-optic recording structure comprises the steps of recording data in the magnetic recording layer through the magneto-optic layer structure to produce a fringing magnetic field and then locally irradiating an area of the magneto-optic layer structure to raise the temperature of the area so that the area aligns itself with the fringing magnetic field.