The Suppression and Recovery of the Ferroelectric Phase in Multiferroic $MnW{O}_4$

Abstract

We report the discovery of a complete suppression of ferroelectricity in $MnW{O}_4$ by 10 % iron substitution and its restoration in external magnetic fields. The spontaneous polarization in $M{n}_{0.9}F{e}_{0.1}W{O}_4$ arises below 12 K in external fields above 4 T. The magnetic/ferroelectric phase diagram is constructed from the anomalies of the dielectric constant, polarization, magnetization, and heat capacity. The observations are qualitatively described by a mean field model with competing interactions and strong anisotropy. We propose that the magnetic field induces a non-collinear inversion symmetry breaking magnetic structure in $M{n}_{0.9}F{e}_{0.1}W{O}_4$.

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• Robust Ferroelectric State in Multiferroic Mn${}_{1-x}$Zn${}_x$WO${}_4$
• Magnetic switching and phase competition in the multiferroic antiferromagnet $\mathrm{M}{\mathrm{n}}_{1-\mathrm{x}}\mathrm{F}{\mathrm{e}}_{\mathrm{x}}\mathrm{W}{\mathrm{O}}_4$
• Magnetic and multiferroic phases of single-crystalline Mn${}_{0.85}$Co${}_{0.15}$WO${}_4$
• Directional magnetoelectric effects in MnWO4: magnetic sources of the electric polarization
• The complex multiferroic phase diagram of Mn${}_{1-x}$Co${}_x$WO${}_4$
• Helicity, anisotropies and their competition in a multiferroic magnet: insight from the phase diagram