Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Skyrmions III (joint session MA/TT/KFM)
MA 35.6: Vortrag
Mittwoch, 14. März 2018, 16:15–16:30, EB 301
Magnetic skyrmion dynamics in thin cylindrical nanodots — •Konstantin Guslienko1, 2 and Zukhra Gareeva3 — 1Depto. Física de Materiales, Universidad del País Vasco, UPV/EHU, 20018 San Sebastián, Spain — 2IKERBASQUE, the Basque Foundation for Science, 48013 Bilbao, Spain — 3Institute of Molecule and Crystal Physics, Russian Academy of Sciences, 450075 Ufa, Russia
Magnetic skyrmions, robust particle-like nanosize objects, attracted considerable attention due to promising applications in spintronics and information technologies. Being a kind of magnetic topological solitons in 2D spin systems, skyrmions exhibit a wide variety of unusual properties related to their topology. In this talk we focus on the low and high frequency dynamics of magnetic skyrmions in the systems of restricted geometry: isolated cylindrical nanodots. We consider Bloch- and Neel skyrmions as the ground magnetic state of thin circular nanodots stabilized due to an interplay of the isotropic and Dzyaloshinskii-Moriya exchange interactions, perpendicular magnetic anisotropy and magnetostatic interaction. We calculate spectrum of spin excitations over the skyrmion background and classify the eigenmodes according to their spatial symmetry. We show that only one gyrotropic mode (rotation of the skyrmion center position with the frequency about of 1 GHz) exists for the skyrmion of definite polarity and the other low frequency modes that are observed in the skyrmion excitation spectra correspond to spin waves. We found an asymmetry between azimuthal spin waves propagating in the clockwise and counter-clockwise directions that is closely related to the skyrmion topology.