High resolution measurement of coercivity variations in magneto-optical recording media

Author

Shieh, H.P.D. ; Kryder, M.H.

Author_Institution

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

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2464

Lastpage

2466

Abstract

The coercivity of amorphous rare-earth-transition-metal magnetooptical recording media has been measured as a function of position on the films utilizing a micro-Kerr-hysteresis-loop tracer with an effective measuring aperture of 0.5 μm. The local variations of wall motion coercivity (H_c) in films whose magnetization reversal was dominated by nucleation were as large as 20%. In contrast, H_c in films whose magnetization reversal was dominated by domain-wall motion exhibited a negligibly small variation from place to place. It was found that the fields required to collapse micron-sized domains were typically 20% less than H_c as measured above. The predominant magnetization-reversal mechanism in the films is mainly determined by fabrication processes

Keywords

Kerr magneto-optical effect; coercive force; magnetic thin films; magneto-optical recording; 0.5 micron; amorphous rare-earth-transition-metal; domain-wall motion; fabrication processes; function of position; high spatial resolution; local variations; magnetization reversal; magnetization-reversal mechanism; magneto-optical recording media; magnetooptical recording media; measurement of coercivity variations; measuring aperture; micro-Kerr-hysteresis-loop tracer; micron-sized domains; nucleation; wall motion coercivity; Amorphous magnetic materials; Amorphous materials; Apertures; Coercive force; Magnetic domains; Magnetic field measurement; Magnetization reversal; Magnetooptic effects; Magnetooptic recording; Position measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92142

Filename

92142