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7–8 Dec 2021 Online only
Europe/Berlin timezone

Single crystal studies on multiferroic LiFe(WO4)2

VC Room link
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7 Dec 2021, 10:30
1h 30m
Board: P-26
Poster Structure Research Poster Session

Speaker

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

Description

Due to their application potential for new types of memory devices, the research on multiferroic materials has attracted strong interest during the last decades. A prominent mechanism that drives multiferroic behavior is given by the inverse Dzyaloshinskii-Moriya interaction, which yields the shift of a non-magnetic ligand ion due to a non-collinear magnetic structure. It was shown on a powdered sample of LiFe(WO$_4$)$_2$ that the onset of a spiral spin structure is accompanied by an evolving ferroelectric polarization, whose direction is consistent with the inverse DMI [1]. Here, we report on our single crystal investigations on LiFe(WO$_4$)$_2$, for which we utilized neutron scattering experiments on HEIDI and on KOMPASS [2]. It was possible to determine the magnetic structure of both incommensurate phases at low temperature, which follow the typical sequence of magnetic phases for a type-II multiferroic material. First, in the intermediate phase a spin-density wave forms and subsequently in the multiferroic phase, a chiral spin structure evolves. Furthermore, longitudinal neutron polarization analysis on the cold three-axes spectrometer KOMPASS revealed a partially unbalanced multiferroic domain distribution that develops in the multiferroic phase and even in absence of external fields.
[1] Liu et al., Phys. Rev. B 95, 195134 (2017) [2] Biesenkamp et al., Phys. Rev. B 103, 134412 (2021)

Primary author

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

Co-authors

Dmitry Gorkov (FRM2) Dr Daniel Brüning (II. Physikalisches Institut, Universität zu Köln) Alexandre Bertin (University Of Cologne) Dr Tobias Fröhlich (II. Physikalisches Institut, Universität zu Köln) Dr Xavier Fabrèges (Laboratoire Léon Brillouin) Dr Arsen Gukasov (Laboratoire Léon Brillouin) Martin Meven (RWTH Aachen University, Institute of Crystallography - Outstation at MLZ) Prof. Petra Becker-Bohatý (Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln) Prof. Ladislav Bohatý (Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln) Prof. Thomas Lorenz (II. Physikalisches Institut, Universität zu Köln) Markus Braden (Universität zu Köln)

Presentation materials