Modeling the magnetomechanical behavior of a multigrain magnetic particle in an elastic environment

Abstract

A new experimentally supported model of the magneto-mechanical behavior of a multigrain magnetically hard microparticle embedded in an elastic matrix is presented.

Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites

“…This fact can be explained by the dominant role of intra-aggregate interparticle magnetic interactions on macroscopic magnetic reversal processes. In other words, the arrangement of the clusters’ chains in the magnetic field orients aggregates of several particles but inside those aggregates, the easy axes of magnetic anisotropy of individual NPs are still distributed randomly [ 54 , 55 ]. Individually single-domain magnetic NPs behave according to the Stoner–Wohlfarth model, thus angular dependence of magnetization was expected to change from rectangular to sloped line for easy and hard axes respectively.…”

“…When an external magnetic field higher than the magnetic anisotropy of particles is applied (H > H A ), a high-energy configuration (C3) is formed because of magnetization of particles. In this case, dipolar forces will invoke a rearrangement of particles to reach another low-energy configuration (C4) if the viscosity of the matrix will allow (as in liquid precursor of polymer in Figure 1 b, when chains were formed) or to arising of mechanical stresses if the matrix is rigid [ 54 , 55 ]. In the case of 3-component NCs, the polymer matrix transfers the mechanical stresses from matrix to BTO particles by elastic coupling that causes their electric polarization due to piezoelectric effect.…”

Magnetic Response of Magnetoactive Elastomers with Allowance for Slippage at the Particle‐Matrix Interfaces

“…For that we take the experimental data from one of our previous works on samples with PDMS matrix filled with MQP‐S‐11‐9 magnetic powder. [ 40 ]…”

“…These reference data are: kA m −1 , MJ m −3 , kg m −3 , µm, µm, Pa s, Pa s, kPa s; elastic properties of the materials were tested in a separate series of experiments. Since our measurements [ 40 ] were performed on the MAE samples polymerized in the absence of external field, the filler particles were assumed to be oriented at random. With allowance for that, each estimation of coercivity at a given κ was obtained by calculating the field cycle on an assembly of randomly oriented () non‐interacting particles.…”

Magnetically active elastomers: ferromagnetic particles under conditions of restricted freedom

“…А для этого достаточно всего лишь понимать, что увеличение (то есть модуля вектора ) означает усиление магнитного поля, в каких бы единицах оно ни измерялось. [11][12][13], технически он весьма сложен. Полученные с его помощью результаты иллюстрирует рис.…”