Spatially-resolved magnetic imaging of magneto-optic recording

Author

Gomez, R.D. ; Kratz, A.R. ; Burke, E.R. ; Mayergoyz, I.D.

Author_Institution

Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3265

Lastpage

3267

Abstract

The spatial evolution and eventual collapse of thermo-magnetically written marks on a conventional TbFeCo magneto-optic medium were imaged as functions of temperature in the presence of an external field. Magnetic force microscopy images with 100 nm scale resolution were obtained from the same area of the medium. The sequential imaging made it possible to observe the domain wall motions of individual marks. Our results indicate that, due to variations in local mechanical and magnetic properties of the medium, wall motion does not proceed uniformly in all directions, but is strongly enhanced in certain areas while impeded in others. These effects lead to formation of complex domain shapes prior to collapse. Quantitative parameters, such as the critical radius for domain collapse as well as domain wall widths, have also been measured

Keywords

cobalt alloys; iron alloys; magnetic domains; magnetic force microscopy; magneto-optical recording; terbium alloys; TbFeCo; domain collapse; domain wall motion; magnetic force microscopy; magnetic properties; magneto-optic recording; mechanical properties; spatially-resolved magnetic imaging; thermo-magnetic writing; Image resolution; Impedance; Magnetic domain walls; Magnetic force microscopy; Magnetic forces; Magnetic properties; Magnetooptic effects; Magnetooptic recording; Spatial resolution; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490344

Filename

490344