Rogerio de Sousa, Marc Allen, Maximilien Cazayous
We present a microscopic theory that shows the importance of spin-orbit coupling in multiferroic compounds with heavy ions. In BiFeO3 (BFO) the spin-orbit coupling at the bismuth ion sites results in a special kind of magnetic anisotropy that is linear in the applied E-field. We show how this interaction is capable of disrupting the magnetic cycloid state of bulk BFO, leading to a remarkable level of E-field control of magnetism.
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http://arxiv.org/abs/1209.6612
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