| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1217 - C8-1218 | |
| DOI | https://doi.org/10.1051/jphyscol:19888551 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1217-C8-1218
DOI: 10.1051/jphyscol:19888551
1 Angewandte Physik, Universitãt Duisburg, Postfach 101503, Duisburg D4100 F.R.G.
2 Max-Planck-Institut für Festkörperforschung, Stuttgart, F.R.G.
J. Phys. Colloques 49 (1988) C8-1217-C8-1218
DOI: 10.1051/jphyscol:19888551
SCALING AND METASTABILITY OF THE RANDOM-FIELD SYSTEM Fe0.7Mg0.3Cl2
U. A. Leitão1, W. Kleemann1 et I. B. Ferreira21 Angewandte Physik, Universitãt Duisburg, Postfach 101503, Duisburg D4100 F.R.G.
2 Max-Planck-Institut für Festkörperforschung, Stuttgart, F.R.G.
Abstract
The field dependence of the critical divergence of (∂M / ∂T)H of zero-field cooled Fe0.7Mg0.3Cl2 agrees with scaling predictions for Fishman-Aharony realizations of the d = 3 random-field Ising model. The time dependence of the thermoremanent magnetization, due to cooling in a field H0, obeys a generalized decay law, µ(t) = a [In (t / r)]-ψ + b. It accounts for the spin relaxation crossing over from a domain wall mechanism to pure domain growth on increasing T and/or H0.