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:
Apr. 24, 2001
Filed:
Sep. 27, 1999
Morimi Hashimoto, Wako, JP;
Tsutomu Shiratori, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A magneto-optical medium comprises a light-transmissive substrate, a third magnetic layer formed on the light-transmissive substrate, a first magnetic layer formed on the light-transmissive substrate, the first magnetic layer having lower domain wall coercivity and allowing higher domain wall mobility than the third magnetic layer at or around an ambient temperature and a second magnetic layer held between the first magnetic layer and the third magnetic layer, the second magnetic layer having a Curie temperature lower than that of the first magnetic layer and the third magnetic layer, wherein the surface roughness, Ra(d), of the first magnetic layer is smaller than the surface roughness, Ra(m), of the third magnetic layer.