Ferroelectric polarization flop in a frustrated magnet MnWO4 induced by magnetic fields
K. Taniguchi, N. Abe, T. Takenobu, Y. Iwasa, T. Arima
Abstract
The relationship between magnetic order and ferroelectric properties has been investigated for MnWO4 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.
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