J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988Proceedings of the International Conference on Magnetism
|Page(s)||C8-1877 - C8-1882|
J. Phys. Colloques 49 (1988) C8-1877-C8-1882
TEMPERATURE DEPENDENCE OF FORMATION AND BREAK DOWN OF VBL CHAINS IN BUBBLE STRIPE DOMAIN WALLSB. S. Han1, X. F. Nie2, G. D. Tang2 et S. G. Huo2
1 Institute of Physics, Academia Sinica, Beijing 100080, China
2 Department of Physics, Hebei Normal University, Shijiazhuang, China
The method of single-pulse bias field was employed to study the temperature dependence of VBL chain formation for soft domain segments, which might be a simulation of the temperature dependence of the "write in" operation of BLM. A critical temperature T02 was found. When T > T02, hard bubbles are no longer formed. It was also found that there are two different stages for VBL formation between R.T. and T02. Their demarcation temperature is T01. As a simulation of BLM minor loops, the hard stripe domains corresponding to ordinary hard bubbles were selected to study the temperature stability of VBL chains. A critical temperature T0 for the break down of VBL chains was found (for the same sample, T0 > T02 > T01). When the testing temperature T < T0, the VBL chains are not changed after temperature increasing and then decreasing. When T > T0, however, they disappear, so that all hard domains become soft. When the VBLs in walls are compressed, the harder the domain, the lower its softening temperature. During softening, the way of VBL disappearance is sudden break down of the whole chain.