# Multiferroic domain relaxation in (NH4)2\[FeCl5(H2O)\] Source: [Multiferroic domain relaxation in (NH4)2\[FeCl5(H2O)\]]() Collection index: [llms.txt]() Data updated: 2025-10-25T05:48:57.739Z Authors: Sebastian Biesenkamp, Karin Schmalzl, Petra Becker, Ladislav Bohaty, Markus Braden Published: 2023-08-29T12:41:42.000Z ## 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. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()