Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.26: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Collective GHz excitations of Skyrmions and spin helices — •Ioannis Stasinopoulos1, Thomas Schwarze1, Andreas Bauer2, Helmuth Berger3, Johannes Waizner4, Markus Garst4, Christian Pfleiderer2, and Dirk Grundler1,5 — 1Physik-Department E10, TU München, Garching, Germany — 2Physik-Department E21, 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 — 5STI, EPFL, Lausanne, Switzerland
Skyrmions are topologically stable spin textures with the spins pointing in all directions wrapping up a sphere. They emerge in chiral-magnets, e.g. MnSi, at approximately 28K and arrange in a hexagonal lattice with typical lattice constants of several tens of nm. Due to spin transfer torque coupling of the Skyrmion lattice with electrical currents a tunable chiral-magnet based device could thus be obtained. Our group uses an all-electrical microwave spectroscopy setup based on a vector analyzer and lithographically fabricated coplanar waveguides to excite and simultaneously probe the Skyrmion states in MnSi. We study the temperature dependence and dispersion of the dynamics both in the ordered phases and above Tc. This investigation opens the way towards Skyrmion-GHz devices. Financial support by the DFG via TRR80 and NIM is acknowledged.