Using an effective Hamiltonian of mutiferroic BiFeO3 (BFO) as a toy model, we explore the effect of the coefficient, C, characterizing the strength of the spin-current interaction, on physical properties. We observe that for larger C values and below a critical temperature, the magnetic moments organize themselves in a novel cycloid which propagates along a low-symmetry direction and is associated with a structural phase transition from polar rhombohedral to a polar triclinic state. We emphasize that both of these magnetic and structural transitions are results of a remarkable self-organization of different solutions of the spin-current model.
@article{arxiv.1312.4161,
title = {Novel magnetic arrangement and structural phase transition induced by spin-lattice coupling in multiferroics},
author = {Satadeep Bhattacharjee and Dovran Rahmedov and Dawei Wang and Laurent Bellaiche},
journal= {arXiv preprint arXiv:1312.4161},
year = {2013}
}