Berlin 2015 – wissenschaftliches Programm
TT 71.51: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
Critical behavior of collective GHz excitations of Skyrmions and spin helices — •Ioannis Stasinopoulos1, Stefan Weichselbaumer1, 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, 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. They emerge in chiral-magnets, e.g. MnSi, and arrange in a hexagonal lattice with typical lattice constants of several tens of nm. 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 spin states. We study and compare the temperature dependence of the dynamics both in the ordered magnetic phases and the regime just above Tc. This study addresses the dynamics of a suspected "Skyrmion liquid" above Tc and aims ultimately at deepening the microscopic understanding of crystallization processes in magnetism. Financial support by the DFG via TRR80 and NIM is acknowledged.