Berlin 2015 – wissenschaftliches Programm
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 Grundler1,5 — 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.