J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
Page(s) C8-1531 - C8-1536
Proceedings of the International Conference on Magnetism

J. Phys. Colloques 49 (1988) C8-1531-C8-1536

DOI: 10.1051/jphyscol:19888702


E. Frey et F. Schwabl

Institut für Theoretische Physik, Physik-Department der Technischen Universität München, James Franck Straße, D-8046 Garching, F.R.G.

The crossover in the dynamics from isotropic to dipolar critical behaviour has been a matter of debate over many years. We review a mode coupling theory for dipolar ferromagnets which gives a unified explanation of the seemingly contradictory experimental situation. The shape functions, the scaling functions for the damping coefficients and the precise position of the crossover are computed. Below Tc only the exchange interaction is taken into account.

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