Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.52: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Collective GHz excitations of Skyrmions and spin helices in Cu₂OSeO₃ — •Stefan Weichselbaumer¹, Ioannis Stasinopoulos¹, Andreas Bauer², Helmuth Berger³, Johannes Waizner⁴, Markus Garst⁴, Christian Pfleiderer², and Dirk Grundler^1,5 — ¹Physik-Department E10, TU München, Garching, Germany — ²Physik-Department, FG Magnetische Materialien, TU München, Garching, Germany — ³EPFL, Institut de physique de la matiere complexe, Lausanne, Switzerland — ⁴Institute for Theoretical Physics, Univ. Köln, Köln, Germany — ⁵IMX, EPFL, Lausanne, Switzerland

Skyrmions are topologically stable spin textures with the spins pointing in all directions wrapping up a sphere. We investigate collective excitations of Skyrmions and spin helices in the GHz-regime in the insulating multiferroic Cu₂OSeO₃. Using an all-electrical microwave spectroscopy setup based on a vector analyzer and lithographically fabricated coplanar waveguides (CPW) we excite and simultaneously probe the dynamics. By modifying the sample shape, CPW design, and excitation configuration, we address the dynamic modes differently. We compare our results with a mean-field theory taking into account dipolar interaction between the spins. The control over the dynamics opens the way towards helimagnet-based high-frequency devices. Financial support by the DFG via TRR80 is acknowledged.