Spin-current model of electric polarization with the tensor gyromagnetic ratio
Abstract
The spin-current model of electric polarization of spin origin is developed for a magnetic structure with anisotropic tensor gyromagnetic ratio (g-factor). Three mechanisms of the magnetoelectric effect are proposed, caused by the symmetric Heisenberg exchange interaction, the Dzyaloshinsky-Moriya interaction, and the spin-spin interaction related to the odd anisotropy of the symmetric exchange interaction of magnetic ions via nonmagnetic ion. The dependence of electric polarization on the spin density and tensor g-factor in the generalized spin-current model is derived. New solutions for macroscopic electric polarization, that arise in the cycloidal and helicoidal spin orders and are caused by the non-diagonal components of the gyromagnetic ratio, are predicted. The extended of the spin-current model to including a tensor g-factor can be important for the magnetic ferroelectrics with heavy ions which take part in the formation of magnetoelectric effect.
Keywords
Cite
@article{arxiv.2604.22968,
title = {Spin-current model of electric polarization with the tensor gyromagnetic ratio},
author = {Mariya Iv. Trukhanova and Pavel A. Andreev},
journal= {arXiv preprint arXiv:2604.22968},
year = {2026}
}