Mean-field theory of the electromagnon resonanceстатья
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Аннотация:We present the analytical theory of the electromagnon resonance for the multiferroicsof spin origin. We consider the spin density evolution under the influence of magnetoelectric coupling in the presence of the electromagnetic wave. The dielectric permeability is found for the eigen-wave perturbations accompanied by perturbations of the electric field. The imaginary part of the dielectric permeability is found as the function of the applied electric field frequency, whereas the frequency of the eigenwaves is found from the dispersion equation as a function of the wave vector and parameters of the system. The result shows the existence of two peaks. One sharp peak is associated with the magnon resonance, while the second wide peak at the approximatelyfour times smaller frequency is interpreted as the electromagnon resonance in accordance withexisting experimental data.