High performance magneto-optical disks using double layered Tb-Fe-Co films

Author

Sugahara, H. ; Tsutsumi, K. ; Hashima, K. ; Tokunaga, T. ; Fujii, Y.

Author_Institution

Mitsubishi Electr. Corp., Hyogo, Japan

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2455

Lastpage

2457

Abstract

Magnetooptical disks using double-layered Tb-Fe-Co films have been developed to obtain a high carrier-to-noise ratio (CNR). The two layers, which have different compositions, are coupled by a magnetic exchange interaction. The recording characteristics and reliability of the double layer have been studied. Optimized double-layered Tb-Fe-Co films and SiN _x protective layers were fabricated on polycarbonate pregrooved substrates. Better than 50-dB CNR, wide power margin, and high recording sensitivity were obtained at 3.7 MHz for 30-mm disk radius and 1800-r.p.m. disk rotation speed. The result of acceleration testing showed that the disks exhibit high reliability

Keywords

cobalt alloys; iron alloys; life testing; magnetic thin film devices; magneto-optical recording; reliability; terbium alloys; 3.7 MHz; SiN_x protective layers; TbFeCo double layered films; acceleration testing; carrier-to-noise ratio; disk radius; disk rotation speed; magnetic exchange interaction; magneto-optical disks; polycarbonate pregrooved substrates; power margin; recording characteristics; reliability; Couplings; Disk recording; Elementary particle exchange interactions; Life estimation; Magnetic films; Magnetic recording; Magnetooptic recording; Protection; Silicon compounds; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92139

Filename

92139