Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 41: Magnetic Textures: Statics and Imaging II
MA 41.3: Vortrag
Donnerstag, 4. April 2019, 10:00–10:15, H37
Modulated Magnetic Structures in GaV4S8 and GaV4Se8 as Seen by Lorentz Transmission Electron Microscopy — •László Balogh1, Markus Preissinger2, Vladimir Tsurkan2, István Kézsmárki2, Sándor Bordács1, Ádám Butykai1, Franziska Harder3, Felix Börrnert3, Daniel Wolf3, and Axel Lubk3 — 1Department of Physics, Budapest University of Technology and Economics — 2Zentrum für Elektronsiche Korrelation und Magnetismus, Institut für Physik, Universität Augsburg — 3Institute for Solid State Research, Leibniz-Institut für Festkörper- und Werk-stoffforschung Dresden
Among bulk materials the lacunar spinel GaV4S8 was the first compound in which Néel-type skyrmions were observed. Although Lorentz transmission electron microscopy (L-TEM) is found to be an excellent probe to study the structure and dynamics of Bloch skyrmions, the L-TEM imaging of the Néel-type modulations in lacunar spinels has so far been elusive. Here, we present a L-TEM study of the magnetic textures in GaV4S8 and GaV4Se8. On thin platelet samples we found that a modulated magnetic order developes below 40 K, which is two times higher compared to bulk crystals. By probing both the local magnetic and crystal structures the coupling between the spin and lattice degrees of freedom was studied in these multiferroic compounds.