Title :
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
fDate :
1/1/1997 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
