We report the cobalt doping dependencies of the ferroelectric polarization and underlying incommensurate spiral magnetic ordering in multiferroic Mn 1-xCoxWO4 (0 ≤ x < 0:18). The spiral ordering changed its rotational plane upon cobalt doping (x ~ 0:1), followed by heliconical ordering at higher doping (x > 0:15). These consecutive changes were accompanied by simultaneous 90° flops of ferroelectric polarizations. Such doping dependencies are driven by the competitions between the anisotropy fields of MnWO4 and CoWO4, the spatial distributions of which are nearly orthogonal to each other. We propose a model that can consistently describe the two consecutive flops based on a combined picture of magnetic anisotropy and biquadratic exchange.
- Incommensurate antiferromagnet
- Magnetic anisotropy
ASJC Scopus subject areas
- Physics and Astronomy(all)