Magnetic switching and phase competition in the multiferroic antiferromagnet $\rm Mn_{1-x}Fe_xWO_4$

Details Magnetic switching and phase competition in the multiferroic antiferromagnet $\rm Mn_{1-x}Fe_xWO_4$ Magnetic switching and phase competition in the multiferroic antiferromagnet $\rm Mn_{1-x}Fe_xWO_4$

2008-10-31

arxiv.org/abs/0810.5736v1

Phys. Rev. B 78, 193101 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.193101

Elastic neutron scattering is used to study the spin correlations in the multiferroic $\rm Mn_{1-x}Fe_{x}WO_4$ with $x=0.035, 0.05$ and 0.10. The noncollinear, incommensurate (ICM) magnetic structure associated with the ferroelectric (FE) phase in pure $\rm MnWO_4$ is suppressed at $x=0.035$ and completely absent at $x=0.10$. The ICM spin order and FE phase can be restored by applying a magnetic field along the spin easy-axis. The low-$T$ commensurate magnetic structure extends in both H/T with increasing Fe concentration. The systematic evolution of the magnetic and electric properties indicates that the noncollinear ICM spin order results from competing magnetic interactions and its stabilization can be tuned by the internal ($x$) or external (magnetic field) perturbations.

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