Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Magnetic Textures: Statics and Imaging II

MA 41.4: Vortrag

Donnerstag, 4. April 2019, 10:15–10:30, H37

Ordering Temperature and Skyrmions in Thin Lamellas of GaMo₄S₈ — •Markus Preißinger¹, Vladimir Tsurkan¹, István Kézsmárki¹, László Balogh³, Sándor Bordács³, Hiroyuki Nakamuro⁴, Franziska Harder², Felix Börrnert², and Axel Lubk² — ¹Zentrum für Elektronsiche Korrelation und Magnetismus, Institut für Physik, Universität Augsburg — ²Institute for Solid State Research, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden — ³Department of Physics, BME Faculty of Natural Science, Budapest University of Technology and Economics — ⁴Department of Materials Science and Engineering, Kyoto University

Lacunar spinels are the first compounds found to host Néel-type skyrmions in their bulk forms. The Néel-type character of the skyrmions is a consequence of the polar rhombohedral distortion of their high-temperature cubic structure. Using Lorentz transmission electron microscopy, in thin lamellas of GaMo₄S₈ we found that the magnetic ordering temperature is 3 times higher compared to bulk crystals. Moreover, instead of Néel-type skyrmion lattices observed in bulk crystals with a typical periodicity of 10-20nm we found Bloch-type skyrmion crystals with lattice constants about 200nm. The change in the character of the skyrmions implies a chiral crystal structure realized in thin lamellas.