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Published on: July 8, 2025
Field-induced surface deformation of magnetoactive elastomers with anisometric fillers: a single-particle model
T A Nadzharyan1, O V Stolbov2, Yu L Raikher2
1Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia. kram@polly.phys.msu.ru and A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Moscow, 119991, Russia.
Abstract:
Surface relief of magnetoactive elastomers (MAEs) based on soft polymer matrices filled with anisometric magnetically hard fillers is studied theoretically in magnetic fields applied perpendicular to the MAE surface. A single-particle 2D cell model describing the rotation of one individual elliptical particle in a near-surface MAE layer is developed. The equilibrium rotation angle of particles is defined by a balance between Zeeman, magnetic anisotropy and elastic (generated in the polymer matrix) energy increments. The Stoner-Wohlfarth model is used to describe magnetic properties of the filler particles while the elastic energy as a function of the particle rotation angle is evaluated numerically using FEM simulations. A representative surface MAE system is constructed via superposition of single-particle cells with field-driven magnetic particles, and surface relief characteristics are derived for various sets of geometric and statistical parameters. Limitations of the proposed approach have been discussed.
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