SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Skyrmions III
MA 35.2: Vortrag
Donnerstag, 30. März 2023, 09:45–10:00, HSZ 04
Moving Antiferromagnetic Skyrmions with Spin Waves — •Michael Lau1,2, Wolfgang Häusler3, and Michael Thorwart1,2 — 1I. Institut für Theoretische Physik, Universität Hamburg — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg — 3Institute of Physics, University of Augsburg
The possibility to move magnetic Skyrmions opens the pathway of technical applications in the form of nanoscale information carriers. While it is well-studied for ferromagnetic materials that spin waves are able to move Skyrmions, driving antiferromagnetic Skyrmions with spin waves is a relatively new topic. We present simulations on a two-dimensional lattice, with classical magnetic moments on each site, which reveal that antiferromagnetic Skyrmions can be accelerated by spin waves injected at one edge of the lattice. We consider in detail various forms of spin waves and draw connections between Skyrmion behavior and the spin wave attributes. To this end we analytically and numerically investigate classical antiferromagnetic spin waves at first. We derive a consistent analytical description of circularly- and linearly polarized spin waves and the two modes of each polarization. Using this knowledge we investigate their impact on the Skyrmion and show that the symmetries of the spin wave modes is reflected in the resulting Skyrmion motion. One example is the non-vanishing Skyrmion Hall effect for circularly polarized spin waves. It turns out that also frequency and amplitude of the spin waves significantly influence the Skyrmion motion.