Calculus of Variations and Geometric Measure Theory

R. Alicandro - M. Cicalese - M. Ruf

Domain formation in magnetic polymer composites: an approach via stochastic homogenization

created by cicalese on 06 Oct 2014
modified on 11 Mar 2016


Published Paper

Inserted: 6 oct 2014
Last Updated: 11 mar 2016

Journal: Arch. Ration. Mech. Anal.
Volume: 218
Number: 2
Pages: 945–984
Year: 2015


We study the magnetic energy of magnetic polymer composite materials as the average distance between magnetic particles vanishes. We model the position of these particles in the polymeric matrix as a stochastic lattice scaled by a small parameter $\varepsilon$ and the magnets as classical $\pm 1$ spin variables interacting via an Ising type energy. Under surface scaling of the energy we prove, in terms of $\Gamma$-convergence that, up to subsequences, the (continuum) $\Gamma$-limit of these energies is finite on the set of Caccioppoli partitions representing the magnetic Weiss domains where it has a local integral structure. Assuming stationarity of the stochastic lattice, we can make use of ergodic theory to further show that the $\Gamma$-limit exists and that the integrand is given by an asymptotic homogenization formula which becomes deterministic if the lattice is ergodic.