| Issue |
EPL
Volume 152, Number 5, December 2025
|
|
|---|---|---|
| Article Number | 56001 | |
| Number of page(s) | 5 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/ae1faa | |
| Published online | 04 December 2025 | |
Mean-field theory of the electromagnon resonance
1 Department of General Physics, Faculty of Physics, Lomonosov Moscow State UniversityMoscow, 119991 Russian Federation
2 Department of Theoretical Physics, Faculty of Physics, Lomonosov Moscow State University Moscow, 119991 Russian Federation
3 Laboratory of Theoretical Physics, Nuclear Safety Institute RAS - B. Tulskaya 52, Moscow, 115191 Russian Federation
Received: 31 July 2025
Accepted: 14 November 2025
Abstract
We present the analytical theory of the electromagnon resonance for the multiferroics of 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 approximately four times smaller frequency is interpreted as the electromagnon resonance in accordance with existing experimental data.
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