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:
May. 06, 2008
Filed:
Jun. 26, 2006
Akinori Furuya, Tokyo, JP;
Hiroshi Yoshikawa, Tokyo, JP;
Takaya Tanabe, Tokyo, JP;
Manabu Yamamoto, Tokyo, JP;
Toshifumi Ohkubo, Tokyo, JP;
Laurence Bouet, Toulouse, FR;
Philippe Tailhades, Paris, FR;
Corine Despax, Paris, FR;
Abel Rousset, Toulouse, FR;
Akinori Furuya, Tokyo, JP;
Hiroshi Yoshikawa, Tokyo, JP;
Takaya Tanabe, Tokyo, JP;
Manabu Yamamoto, Tokyo, JP;
Toshifumi Ohkubo, Tokyo, JP;
Laurence Bouet, Toulouse, FR;
Philippe Tailhades, Paris, FR;
Corine Despax, Paris, FR;
Abel Rousset, Toulouse, FR;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
The Centre National de la Recherche Scientifique, Paris Cedex, FR;
Abstract
A magneto-optical recording medium has a recording layer and a reflective layer on a substrate. The recording layer has a layered structure in which at least one spinel ferrite (or rutile-type oxide or hematite) layer and at least one garnet ferrite layer are piled together. It is preferable that the layered structure is formed on tracks where data are recorded. A manufacturing method comprises the steps of heat treatment in the range of 500-700° C., preferably 600-630° C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data, the wavelength of light for recording data is different from that for reading data, which is preferable for a magneto-optical recording medium comprising a garnet ferrite layer.