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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• 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
• Cycloidal magnetism driven ferroelectricity in double tungstate LiFe(WO${}_4$)${}_2$
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• 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
• Magnetic field-induced spontaneous polarization reversal in multiferroic Mn${}_{0.85}$Co${}_{0.15}$WO${}_4$
• Landau theory for the phase diagram of the multiferroic Mn${}_{1-x}$(Fe,Zn,Mg)${}_x$WO${}_4$
• Spin-Wave and Electromagnon Dispersions in Multiferroic MnWO4 as Observed by Neutron Spectroscopy: Isotropic Heisenberg Exchange versus Anisotropic Dzyaloshinskii-Moriya Interaction
• High-pressure synthesis, crystal and electronic structures of a new scandium tungstate, Sc0.67WO4