Optical and magnetic measurements of time dependence effects in magneto-optic thin films

Author

Thomson, T. ; O´Grady, K. ; Brown, S. ; Haycock, P.W. ; Williams, E.W.

Author_Institution

Univ. Coll. of North Wales, Bangor, UK

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2515

Lastpage

2517

Abstract

The authors compare the results obtained from optical and magnetic measurements on TbFeCo magnetooptic thin films. Optical measurements were performed using a polar Kerr magnetometer, that is, the surface magnetization was probed. Bulk magnetic measurements were performed on an alternating gradient force magnetometer. Analysis of the dependence data from both techniques revealed similar activation volumes of reversal of approximately 1×10^-18 cm³. As this is the volume required to nucleate a magnetic reversal, it may set a bound on the minimum domain size

Keywords

Kerr magneto-optical effect; cobalt alloys; coercive force; ferrimagnetic properties of substances; iron alloys; magnetic hysteresis; magnetic surface phenomena; magnetic thin films; magnetisation; magnetisation reversal; magneto-optical recording; terbium alloys; TbFeCo; activation volumes of reversal; alternating gradient force magnetometer; coercive field; magnetic hysteresis loop; magnetic reversal; magneto-optic thin films; minimum domain size; polar Kerr magnetometer; squareness; surface magnetization; time dependence effects; Force measurement; Magnetic analysis; Magnetic domains; Magnetic films; Magnetic variables measurement; Magnetization; Magnetometers; Magnetooptic effects; Optical films; Performance evaluation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179541

Filename

179541