Application of magnetic field ( H ) can produce the ferroelectric polarization ( P ) in a proper screw helimagnet, ZnCr 2 Se 4 . While rotating H , we observed the cyclic generation of polarization current arising from the change of P in the conical spin structure. Versatile variations of P in magnitude and sign are observed while changing the direction and magnitude of H . The behaviors are ascribed to the rotation of the spin cones and the conserving or reversing spin-helicity upon the flop of the screw propagation vector, as affected by the competition among the magnetic anisotropy, inclination of the cone axis to H , and the P domain-wall stability.
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Murakawa et al. (2008) studied this question.
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