Temperature dependence of activation volumes in Tb-Fe-Co magneto-optic thin films

Author

Thomson, T. ; Grady, K.O.

Author_Institution

SEECS, Univ. Coll. of North Wales, Bangor, UK

Volume

33

Issue

1

fYear

1997

fDate

1/1/1997 12:00:00 AM

Firstpage

795

Lastpage

798

Abstract

In this paper, we present the results of an investigation into the temperature dependence of fluctuation fields, activation volumes, and coercivity in Tb-Fe-Co magneto-optic thin films. Using the model of domain wall dynamics developed by Gaunt (1976), both the temperature dependence of the intrinsic energy barrier distribution and the domain wall pinning regime are examined. The results show that at elevated temperatures, the intrinsic energy barrier distribution changes in a way that assists magnetization reversal, leading to greater activation volumes as the magneto-optic write temperature is approached. Analysis of coercivity as a function of temperature shows that these magneto-optic thin films are subject to a strong domain wall pinning regime

Keywords

cobalt alloys; coercive force; ferrimagnetic materials; iron alloys; magnetic domain walls; magnetic hysteresis; magnetic thin films; magnetisation reversal; magneto-optical recording; remanence; terbium alloys; 290 to 460 K; Gaunt model; Tb-Fe-Co magneto-optic thin films; Tb₂₆Fe₆₆Co₈; activation volumes; coercivity; demagnetizing remanence curves; domain wall dynamics; domain wall pinning regime; ferrimagnetic film; fluctuation fields; hysteresis loops; intrinsic energy barrier distribution; magnetization reversal; magneto-optic write temperature; temperature dependence; Coercive force; Energy barrier; Fluctuations; Magnetic domain walls; Magnetic domains; Magnetic materials; Magnetization reversal; Magnetooptic effects; Temperature dependence; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.560114

Filename

560114