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Linear Magnetoelectric Effect by Orbital Magnetism

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arxiv 1207.2916 v2 pith:24IDUEXO submitted 2012-07-12 cond-mat.mtrl-sci

Linear Magnetoelectric Effect by Orbital Magnetism

classification cond-mat.mtrl-sci
keywords orbitallinearmagneticmomentsappliedeffectelectricfield
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We use symmetry analysis and first principles calculations to show that the linear magnetoelectric effect can originate from the response of orbital magnetic moments to the polar distortions induced by an applied electric field. Using LiFePO4 as a model compound we show that spin-orbit coupling partially lifts the quenching of the 3d orbitals and causes small orbital magnetic moments ($\mu_{(L)}\approx 0.3 \mu_B$) parallel to the spins of the Fe$^{2+}$ ions. An applied electric field $\mathbf{E}$ modifies the size of these orbital magnetic moments inducing a net magnetization linear in $\mathbf{E}$.

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