Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.27: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Chiral magnetic resonances of Skyrmions and helices — •Johannes Waizner¹, Markus Garst¹, Achim Rosch¹, Ioannis Stasinopoulos², Thomas Schwarze², Andreas Bauer³, Helmuth Berger⁴, Christian Pfleiderer³, and Dirk Grundler^2,5 — ¹Institute for Theoretical Physics, Univ. Köln, Köln, Germany — ²Physik Department, E10, TU München, Garching, Germany — ³Physik Department, FG Magnetische Materialien, TU München, Garching, Germany — ⁴EPFL, Institure de physique de la matière complexe, Lausanne, Swizerland — ⁵STI, EPFL, Lausanne, Switzerland

Chiral magnets realize skyrmionic and helical magnetic textures. We study theoretically their microwave excitations driven by an oscillating magnetic or electric field. Extending the theory for ferromagnetic resonance (FMR) to the present case, we determine the position and the weight of the resonance frequencies including the effect of demagnetization fields and dipolar interactions. In contrast to the single Kittel mode present in polarized ferromagnets, we find multiple modes within the helical and skyrmion lattice phase with a characteristic dependence on the direction of both the applied static as well as the ac fields. Our theory is in quantitative agreement with recent experimental results.