Multiferroic domain relaxation in (NH4)2[FeCl5(H2O)]

Abstract

The molecular compound (NH4)2[FeCl5(H2O)] is a type-II multiferroic material, in which incommensurate cycloidal order directly induces ferroelectric polarization. The multiferroic domain kinetics in (NH4)2[FeCl5(H2O)] were studied by time-resolved neutron diffraction experiments utilizing neutron polarization analysis. The temperature and electric-field dependent multiferroic relaxation obeys the simple combined Arrhenius-Merz law, which was reported to describe domain kinetics in the prototype multiferroics TbMnO3 and NaFeGe2O6. However, the characteristic time scale of the multiferroic relaxation is considerably larger than those in TbMnO3 or NaFeGe2O6. Temperature-dependent diffraction on (NH4)2[FeCl5(H2O)] reveals the emergence of higher-order and commensurate magnetic contributions upon cooling in the multiferroic phase in zero field. The good agreement with studies of higher-harmonic contributions in the deuterated material indicates that the isotopes only posses a minor impact on the magnetic ordering. But in contrast to similar observations in multiferroic MnWO4, this anharmonic modification of magnetic ordering does not depin multiferroic domain walls or alter the temperature dependence of the multiferroic relaxation.

arXiv comment10 pages, 9 Figures

References in corpus (19)

• Ferroelectricity in spiral magnets
• Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3
• Neutron diffraction study of TbMnO3: Magnetic structure revisited
• Tunable Quantum Tunneling of Magnetic Domain Walls
• Nature of the magnetic order and origin of induced ferroelectricity in TbMnO${}_3$
• Time-resolved imaging of magnetoelectric domain switching in multiferroic MnWO4
• Thermodynamic properties of the new multiferroic material (NH${}_4$)${}_2$[FeCl${}_5$(H${}_2$O)]
• Topology and manipulation of multiferroic hybrid domains in MnWO${}_4$
• Domain dynamics in the multiferroic phase of MnWO4
• Dzyaloshinsky-Moriya driven helical-butterfly structure in Ba3NbFe3Si2O14
• Kinetics of the Multiferroic Switching in MnWO${}_4$
• Spin-lattice coupling mediated multiferroicity in (ND4)2FeCl5D2O
• Magnetic-Field-Induced Change of Magneto-Electric Coupling in the in Molecular Multiferroic (ND4)2[FeCl5(D2O)]
• Magnetoelectric properties of $A_2$[FeCl${}_5$(H${}_2$O)] with $A=$ K, Rb, Cs
• Magnetoelectric coupling in the mixed erythrosiderite [(NH${}_4$)${}_{1-x}$K${}_x$]${}_2$[FeCl${}_5$(H${}_2$O)]
• Spin-wave dispersion and magnon chirality in multiferroic TbMnO3
• Magnetic Excitations of the Hybrid Multiferroic (ND4)2FeCl5D2O
• Structural dimerization in the commensurate magnetic phases of NaFe(WO${}_4$)${}_2$ and MnWO${}_4$
• Chiral Order and Multiferroic Domain Relaxation in NaFeGe${}_2$O${}_6$