Domain wall mobility measurements in magneto-optic media

Author

Du, Mann ; Kryder, Mark H.

Author_Institution

Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4401

Lastpage

4403

Abstract

Domain wall motion involved in both writing and erasing processes in Magneto-Optic (MO) recording is strongly governed by domain wall mobility. This report extends our previous measurements by a highly sensitive Kerr microscope system of domain wall mobility in MO media to temperature ranges near the Curie temperature (T_c). The velocity of wall motion is measured as a function of the applied field in samples of GdTbFe and GdTbFeCo, with different compositions and compensation temperatures. The experimental temperature ranges from 60°C to 10°C below T_c. The collected data show that for samples of different composition,the domain wall mobilities increase approximately exponentially as the temperature approaches T_c from about 0.02 cm/sec-Oe to 5 cm/sec-Oe

Keywords

Curie temperature; cobalt alloys; ferromagnetic materials; gadolinium alloys; iron alloys; magnetic domain walls; magnetic domains; magnetic multilayers; magneto-optical effects; magneto-optical recording; terbium alloys; Curie temperature; GdTbFe; GdTbFeCo; Kerr microscope system; compensation temperatures; domain wall mobility measurements; erasing processes; magneto-optic media; magneto-optic recording; wall motion velocity; writing processes; Dielectric substrates; Laser mode locking; Magnetic domain walls; Magnetic field measurement; Magnetooptic recording; Microscopy; Pulse measurements; Temperature distribution; Temperature sensors; Velocity measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334101

Filename

334101