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:
Feb. 01, 2000
Filed:
Feb. 25, 1998
Koji Matsumoto, Kawasaki, JP;
Keiji Shono, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magneto-optical recording medium capable of performing magnetically induced super resolution reproduction by perfectly masking a mark adjacent to a mark to be reproduced. The magneto-optical recording medium includes a transparent substrate, a magnetic reproducing layer laminated on the transparent substrate, a magnetic control layer laminated on the reproducing layer, and a magnetic recording layer laminated on the control layer. The reproducing layer has an easy axis of magnetization in a plane at room temperature. Each of the control layer and the recording layer has an easy axis of magnetization perpendicular to the substrate. When a given reproducing power is applied to the medium, there are formed in a laser spot on the medium a low-temperature area where the direction of magnetization of the reproducing layer is made identical with an in-plane direction, an intermediate-temperature area where the magnetization of the recording layer is transferred through the control layer to the reproducing layer by exchange bond, and a high-temperature area whose temperature is higher than the Curie temperature of the control layer. In the low-temperature area, an in-plane mask is formed. In the high-temperature area, an up spin mask is formed. Further, an opening allowing a magneto-optical signal to be read is formed between the two masks.