Ferroelectric polarization flop in a frustrated magnet MnWO${}_4$ induced by magnetic fields

Abstract

The relationship between magnetic order and ferroelectric properties has been investigated for MnWO${}_4$ with long-wavelength magnetic structure. Spontaneous electric polarization is observed in an elliptical spiral spin phase. The magnetic-field dependence of electric polarization indicates that the noncollinear spin configuration plays a key role for the appearance of ferroelectric phase. An electric polarization flop from the b direction to the a direction has been observed when a magnetic field above 10T is applied along the b axis. This result demonstrates that an electric polarization flop can be induced by a magnetic field in a simple system without rare-earth f-moments.

9 pages, 4 figures

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