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Ab Initio Cycloidal and Chiral Magnetoelectric Responses in Cr₂O₃

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arxiv 1603.00665 v2 pith:ONHVYRUE submitted 2016-03-02 cond-mat.mtrl-sci

Ab Initio Cycloidal and Chiral Magnetoelectric Responses in Cr₂O₃

classification cond-mat.mtrl-sci
keywords cycloidalphasesrelativisticspintermactivealphaarises
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a thorough density functional theory study of the magneto-electric (ME) effect in Cr$_{2}$O$_{3}$. The spin-lattice ME tensor $\alpha$ was determined in the low-field and spin flop (SF) phases, using the method of dynamical magnetic charges, and found to be the sum of three distinct components. Two of them, a large relativistic "cycloidal" term and a small longitudinal term, are independent on the spin orientation. The third, only active in the SF phases is also of relativistic origin and arises from magnetic-field-induced chirality, leading to a non-toroidal ME response.

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