Hysteresis for ferromagnetism: asymptotics of some 2-scale Landau-Lifshitz model

Details Hysteresis for ferromagnetism: asymptotics of some 2-scale Landau-Lifshitz model Hysteresis for ferromagnetism: asymptotics of some 2-scale Landau-Lifshitz model

2011-09-20

arxiv.org/abs/1109.4352v1

Mathematics

Analysis of PDEs

Scientific paper

We study a 2-scale version of the Landau-Lifshitz system of ferromagnetism, introduced by Starynkevitch to modelize hysteresis: the response of the magnetization is fast compared to a slowly varying applied magnetic fi eld. Taking the exchange term into account, in space dimension 3, we prove that, under some natural stability assumption on the equilibria of the system, the strong solutions follow the dynamics of these equilibria. We also give explicit examples of relevant equilibria and exterior magnetic fields, when the ferromagnetic medium occupies some ellipsoidal domain.

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