Coupled magnetic and ferroelectric states in the distorted honeycomb system Fe${}_4$Ta${}_2$O${}_9$

Abstract

We report on the magnetic, thermodynamic, dielectric, and pyroelectric measurements on the hitherto unreported Fe${}_4$Ta${}_2$O${}_9$. This system is seen to exhibit a series of magnetic transitions, many of which are coupled to the emergence of ferroelectric order, making Fe${}_4$Ta${}_2$O${}_9$ the only genuine multiferroic in its material class. We suggest that the observed properties arise as a consequence of an effective reduction in the dimensionality of the magnetic lattice, with the magnetically active Fe${}^{2+}$ ions preferentially occupying a quasi 2D buckled honeycomb structure. The low temperature $H$-$T$ phase diagram of Fe${}_4$Ta${}_2$O${}_9$ reveals a rich variety of coupled magnetic and ferroelectric phases, in similarity with that observed in the distorted Kagome systems.

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• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Coupled magnetic and ferroelectric domains in multiferroic Ni3V2O8
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Cited by in corpus (4)

• Anisotropy in the magnetization and magnetoelectric response of single crystalline Mn${}_4$Ta${}_2$O${}_9$
• Noncollinear antiferromagnetic order in the buckled honeycomb lattice of magnetoelectric Co4Ta2O9 determined by single-crystal neutron diffraction
• Pressure driven re-entrant magnetoelectric transition in honeycomb $F{e}_{4}N{b}_2{O}_9$
• Modulated non-collinear magnetic structure of (Co${}_{0.97}$${}^{57}$Fe${}_{0.03}$)${}_4$Nb${}_2$O${}_9$ as revealed by Mössbauer spectroscopy