Regensburg 2016 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Focus Session: Skyrmions meet Multiferroicity

DF 9.5: Topical Talk

Mittwoch, 9. März 2016, 11:30–12:00, H25

Collective spin excitations at GHz frequencies in Skyrmion-hosting bulk materials — •Dirk Grundler — Laboratoire des Matériaux Magnétiques Nanostructurés and Magnoniques, Institut des Matériaux, Faculté Science et Technique de l’Ingénieur, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

Skyrmion-hosting materials have generated great research efforts in fundamental and applied sciences. Collective spin excitations in the GHz frequency regime are in particular interesting as they provide information about the system’s free energy and define response times in possible applications, respectively. We report on GHz spectroscopy performed on different bulk materials. For cubic chiral helimagnets supporting Bloch-type Skyrmions, such as insulating Cu₂OSeO₃ and semiconducting Fe_0.8Co_0.2Si, we found a universal behavior when studying the GHz response throughout the magnetic phase diagram (T. Schwarze et al., Nat. Mater. 14, 478 (2015)). Comparing with data from the polar magnetic semiconductor GaV₄S₈ supporting Néel-type Skyrmions (D. Ehlers et al., arXiv:1512.02391), characteristic changes in the spectra are encountered that we attribute to an additional uniaxial magnetic anisotropy. We acknowledge financial support by the DFG via TRR80. The reported works are performed in cooperations with A. Bauer, H. Berger, D. Ehlers, T. Fehér, M. Garst, I. Kézsmárki, H.-A. Krug von Nidda, A. Leonov, A. Loidl, C. Pfleiderer, T. Schwarze, I. Stasinopoulos, V. Tsurkan, J. Waizner, and S. Weichselbaumer.