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Domain Formation in Magnetic Polymer Composites: An Approach Via Stochastic Homogenization

Abstract

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 ɛ 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 Γ-convergence, that, up to subsequences, the (continuum) Γ-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 Γ-limit exists and that the integrand is given by an asymptotic homogenization formula which becomes deterministic if the lattice is ergodic.

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Correspondence to Marco Cicalese.

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Communicated by A. Braides

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Alicandro, R., Cicalese, M. & Ruf, M. Domain Formation in Magnetic Polymer Composites: An Approach Via Stochastic Homogenization. Arch Rational Mech Anal 218, 945–984 (2015). https://doi.org/10.1007/s00205-015-0873-y

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Keywords

  • Voronoi Cell
  • Domain Formation
  • Discrete Energy
  • Voronoi Tessellation
  • Magnetic Polymer