We have carried out a spin-polarized-neutron study on multiferroic CuCrO 2 to clarify the origin of the ferroelectricity. The neutron results demonstrate that an incommensurate proper-screw magnetic structure of CuCrO 2 induces electric polarization. Not only the magnetic structure but also the oxygen location contributes to the ferroelectricity of CuCrO 2 . The electric polarization of CuCrO 2 can be explained not by a conventional spin-current model but by a theoretical prediction proposed by Arima. The spin helicities of CuCrO 2 can be reversed by the reversal of the electric field E in the multiferroic phase.
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Soda et al. (2009) studied this question.
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