Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Skyrmions II (joint session MA/TT/KFM)

KFM 9.3: Vortrag

Dienstag, 13. März 2018, 10:00–10:15, EB 301

Optically induced demagnetization and coherent spin excitations in GaV4S8 — •Fumiya Sekiguchi¹, Prashant Padmanabhan¹, Rolf B. Versteeg¹, István Kézsmárki², and Paul H. M. van Loosdrecht¹ — ¹Institute of Physics 2, University of Cologne, 50937 Cologne, Germany — ²Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany

Skyrmions are quasiparticle-like topological spin textures stabilized in non-centrosymmetric crystals with Dzyaloshinskii-Moriya interactions. For potential applications and a better understanding of their nature, it is important to understand their creation and annihilation dynamics, as well as their collective excitation spectrum. Here we employ time resolved magneto-optical Kerr experiments to study the magnetization dynamics in the lacunar spinel GaV4S8 which hosts novel cycloid and Néel-type skyrmion magnetic ground states. The experiments show the emergence of a slow demagnetization process in the magnetically ordered states. In addition, we observe coherent collective spin excitations in both the cycloid and skyrmion phases.