Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.23: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
All-electrical spin-wave spectroscopy on skyrmions in MnSi — •Ioannis Stasinopoulos1, Thomas Schwarze1, Andreas Bauer2, Helmuth Berger3, Johannes Waizner4, Markus Garst4, Christian Pfleiderer2, Achim Rosch4, 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 — 5STI, EPFL, Lausanne, Switzerland
Skyrmions are topologically stable spin textures with the spins pointing in all directions wrapping up a sphere. The resulting core spins point in opposite direction compared to the outside ones. The recently discovered skyrmion phase (so-called A phase) is formed in a specific magnetic field-temperature (H-T) region of chiral helimagnets, such as MnSi, where skyrmions crystallize at about T=28 K and µ0H=200 mT in a hexagonal lattice with a typical lattice constant of 18 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 skyrmion states in MnSi. An out-of plane static magnetic field in combination with a He flow cryostat is used to define the skyrmion phase conditions. The observed resonances lie in the low GHz regime. Financial support by the DFG via TRR80 and NIM is acknowledged.