Thickness dependence of magnetic properties in GdDy/FeCo film

Author

Uchihara, Y. ; Tanase, K. ; Suzuki, Y. ; Torazawa, K.

Author_Institution

Sanyo Electric Co. Ltd., Gifu, Japan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3784

Lastpage

3786

Abstract

For a better understanding of the dynamic characteristics of GdDy/FeCo magnetooptical (MO) disks, the magnetic properties of GdDy/FeCo films with various thicknesses were investigated. The MO layer, whose thickness was varied from 200 Å to 1500 Å, was sandwiched by dielectric SiN layers. Kerr rotation angle decreased as the MO layer was made thinner, while the reflectivity showed little change. T_comp shifted lower with decreasing thickness, while T_c was constant. The CNR value saturated above 600 Å thickness, while noise level was less influenced with the thickness. Therefore, the increase in CNR is mainly due to the carrier level and caused by an increase of Kerr rotation angle. The degradation of CNR at lower magnetic fields is also discussed

Keywords

Kerr magneto-optical effect; cobalt alloys; coercive force; dysprosium alloys; gadolinium alloys; iron alloys; magnetic multilayers; magnetic thin films; magneto-optical recording; noise; 200 to 1500 angstroms; CNR value; Kerr rotation angle; SiN-GdDy-FeCo-SiN; X-ray fluorescence analysis; carrier-to-noise ratio; coercivity; dynamic characteristics; magnetic fields; magnetic properties; magnetooptical discs; noise level; reflectivity; saturation magnetisation; thickness dependence; thin film; Amorphous magnetic materials; Magnetic fields; Magnetic films; Magnetic properties; Optical films; Optical recording; Optical saturation; Saturation magnetization; Silicon compounds; Substrates;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281299

Filename

281299