Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

Single crystal investigations on the new multiferroic material LiFe(WO$_4$)$_2$

Dec 10, 2020, 1:45 PM
15m
Online event

Online event

Talk DN: Magnetism DN2020: Magnetism

Speaker

Sebastian Biesenkamp (II. Physikalisches Institut, Universität zu Köln)

Description

Multiferroic materials attract much interest during the last decades as the coupling of electric and magnetic ordering offers an application potential for future memory devices or new type of sensors. The most prominent mechanism for multiferroicity is given by the inverse Dzyaloshinskii-Moriya interaction, where a spiral magnetic structure induces a shift of non-magnetic ligand ions and hence a ferroelectric polarization, which can be controlled by the conjugate field of both ferroic ordering parameters. Recently, experiments on a powdered sample of LiFe(WO$_4$)$_2$ revealed two subsequent magnetic phases, of which the lower one exhibits multiferroic behavior [1]. Beneath MnWO$_4$, LiFe(WO$_4$)$_2$ is thus the second multiferroic system in this family. Here we report on our single crystal studies on LiFe(WO$_4$)$_2$ and on the respective structural and magnetic refinements. Neutron diffraction experiments revealed the magnetic structure of both magnetic phases, where first a spin-density wave and subsequently a chiral magnetic structure evolves. Moreover, polarization analysis on the cold three-axes spectrometer KOMPASS unambiguously proves the chiral magnetic phase and shows that even without an external applied electric field a preferred handedness occurrs.
[1] Liu et al. Phys. Rev. B 95, 195134 (2017)

Primary author

Sebastian Biesenkamp (II. Physikalisches Institut, Universität zu Köln)

Co-authors

Dmitry Gorkov (FRM2) Daniel Brüning (II. Physikalisches Institut, Universität zu Köln) Alexandre Bertin (II. Physikalisches Institut, Universität zu Köln) Tobias Fröhlich (II. Physikalisches Institut, Universität zu Köln) Xavier Fabreges (Laboratoire Léon Brillouin, C.E.A./C.N.R.S.) Arsen Goukassov (Laboratoire Léon Brillouin, C.E.A./C.N.R.S.) Martin Meven (RWTH Aachen University, Institute of Crystallography - Outstation at MLZ) Petra Becker (Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln) Ladislav Bohatý (Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln) Thomas Lorenz (II. Physikalisches Institut, Universität zu Köln) Markus Braden (II. Physikalisches Institut, Universität zu Köln)

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