Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Skyrmions I
MA 16.8: Vortrag
Dienstag, 10. März 2026, 11:30–11:45, HSZ/0004
Magnetic anisotropies resolved in the skyrmion-host GaV4S8 by high-field electron spin resonance spectroscopy — •Ignác Fejes1, Titusz Fehér1, Norbert Marcell Nemes1, András Jánossy2, Dávid Szaller1,2,3, Sándor Bordács3,5, Vladirmir Tsurkan3, and István Kézsmárki4 — 1Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Muegyetem rkp. 3., H-1111 Budapest, Hungary — 2HUN-REN-BME Condensed Matter Physics Research Group, Budapest University of Technology and Economics, Muegyetem rkp. 3., H-1111 Budapest, Hungary — 3Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg, Germany — 4GFMC, Departamento de Fisica de Materiales Universidad Complutense de Madrid, 28040 — 5Institute of Applied Physics, MD 2028, Chisinau, R. Moldova
Appearance of exotic types of magnetic ordering, such as skyrmions, strongly depends on the magnetic anisotropies present in a material, particularly in axially symmetric systems where second-order anisotropy in spin-orbit coupling is allowed. Here, we used high-field electron spin resonance spectroscopy (ESR) to study the field and orientation dependence of the spin excitation in the field-polarized state of GaV4S8. Below TS = 44 K, the material transforms from a cubic phase to a polar rhombohedral phase, giving rise to multiple structural domains at low temperatures. We assigned the observed resonance modes to the corresponding polar domains and identified the relevant anisotropies - magnetocrystalline and g-factor - of GaV4S8.
Keywords: Skyrmion; Anisotropy