Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 12: Skyrmions 1 (joint session MA/KFM)
MA 12.7: Vortrag
Dienstag, 6. September 2022, 11:15–11:30, H37
Spin Wave Driven Skyrmions in Antiferromagnets — •Michael Lau1, Wolfgang Häusler2, and Michael Thorwart1 — 1I. Institut für Theoretische Physik, Universität Hamburg — 2Institute of Physics, University of Augsburg
In a two-dimensional lattice of antiferromagnetically coupled classical magnetic moments of unit length it is theoretically possible to stabilize Skyrmions when appropriately adjusting the Dzyaloshinskii-Moriya interaction (DMI) and a uniaxial anisotropy. We present simulations on a discrete lattice which reveal that these Skyrmions can be moved by spin waves injected at one edge of the lattice. It is known that in ferromagnets spin waves are scattered by Skyrmions, imposing a driving force on them. In antiferromagnets, we find similar scattering of spin waves by Skyrmions, exerting a net driving force. However, contrary to ferromagnets, the driving force acts in the direction of spin wave propagation and the Skyrmion accelerates like a classical particle with finite mass, as typically found for antiferromagnetic solitons. Additionally, we exploit the fact that antiferromagnetic spin waves can appear left- or right handed and study the impact of spin waves of different polarizations on the Skyrmion. It turns out that chirality, frequency and amplitude of the spin waves all significantly influence the Skyrmion motion.