Improvement in recording power sensitivity for overwritable MO media by RE-rich GdNdFeCo control layer

Author

Hayashi, Kazuhiko ; Okada, Osamu

Author_Institution

NEC Corp., Kawasaki, Japan

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5100

Lastpage

5102

Abstract

For improvement in recording power sensitivity in overwritable magnetooptic media with exchange coupled trilayer (ECTL), it has been found necessary to decrease the saturation magnetization (M_s) value for the control layer, as well as to reduce the Curie temperature (T_c) value for the writing layer. Highly rare-earth (RE) rich GdNdFeCo film has been used to decrease the M_s value for the control layer, instead of ferromagnetic NdFeCo film. The media consists of a PC substrate, a SiN underlayer, a transition-metal-rich TbFe memory layer, a NdFeCo or highly RE-rich GdNdFeCo control layer, an RE-rich GdNdFeCo writing layer whose compensation temperature is 180°C, and an SiN protective layer. By using the RE-rich GdNdFeCo control layer and the lower T_c writing layer, the recording power sensitivity was improved 1.5 times compared to the media with NdFeCo control layer without decreasing the carrier-to-noise ratio

Keywords

Curie temperature; cobalt alloys; gadolinium alloys; iron alloys; magnetisation; magneto-optical recording; neodymium alloys; Curie temperature; GdNdFeCo film; carrier-to-noise ratio; compensation temperature; control layer; exchange coupled trilayer; overwritable MO media; overwritable magnetooptic media; recording power sensitivity; saturation magnetization; writing layer; Couplings; Magnetic field measurement; Magnetization; Plasma measurements; Plasma temperature; Protection; Silicon compounds; Temperature control; Temperature sensors; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278753

Filename

278753