Centre National De La Recherche Scientifique

Nippon Telegraph and Telephone Corporation

Corine Despax

Hiroshi Yoshikawa

Manabu Yamamoto

Abel C Rousset

Philippe Tailhades

Takaya Tanabe

Laurence Bouet

Akinori Furuya

Toshifumi Ohkubo

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&#xb0; C., preferably 600-630&#xb0; 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.

Magneto-optical recording medium, manufacturing method thereof and magneto-optical data recording and playback device

This invention relates to magneto-optical recording media such as magneto-optical disks and cards, manufacturing methods of the medium and a magneto-optical recording and playback device to record and play back data using the magneto-optical recording media. The magneto-optical recording medium of the present invention has a recording layer and a reflective layer on a substrate, and 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. The manufacturing method of the present invention comprises the steps of heat treatment in the range of 500-700&deg; C., preferably 600-630&deg; C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data of the present invention, 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.

Opto-magnetic recording medium with a garnet ferrite recording layer, and opto-magnetic information recording/reproducing device

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Corine Despax