Theory of magnetic switching of ferroelectricity in spiral magnets

Details Theory of magnetic switching of ferroelectricity in spiral magnets Theory of magnetic switching of ferroelectricity in spiral magnets

2010-10-28

arxiv.org/abs/1010.5970v1

Phys. Rev. Lett. 105, 187601 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.187601

We propose a microscopic theory for magnetic switching of electric polarization (P) in the spin-spiral multiferroics by taking TbMnO3 and DyMnO3 as examples. We reproduce their phase diagrams under a magnetic field H_ex by Monte-Carlo simulation of an accurate spin model and reveal that competition among the Dzyaloshinskii-Moriya interaction, spin anisotropy, and spin exchange is controlled by the applied H_ex, resulting in magnetic transitions accompanied by reorientation or vanishing of P. We also discuss the relevance of the proposed mechanisms to many other multiferroics such as LiCu2O2, MnWO4, and Ni3V2O4

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