Modulated multiferroic properties of MnWO 4 via chemical doping

Here we prepare polycrystalline Mn1−xNixWO4 ceramics with x = 0, 0.02, 0.04, 0.06 for investigating their magnetic, ferroelectric, and multiferroic properties. The Ni2+-substitution gradually expands the lattice and modifies the magnetic performance with increasing x, resulting in a strong modulation of electric properties of those samples. For Mn0.96Ni0.04WO4, ferroelectric polarization is observed in the whole temperature regime below TAF2, and is well modified by an external magnetic field, which is discussed under the framework of a spin-current model in this manuscript.