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MA: Fachverband Magnetismus
MA 26: Non-Skyrmionic Magnetic Textures II
MA 26.6: Vortrag
Mittwoch, 29. März 2023, 11:15–11:30, HSZ 401
Blowing magnetic smoke rings (hopfions) — •Philipp Geßler1 and Jan Masell1,2 — 1Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2RIKEN CEMS, Wako, Japan
Hopfions are three-dimensional topological defects in magnetization, consisting of a closed skyrmion-string loop. Embedded in the field polarized phase, they are reminiscent of smoke rings in the air. In contrast to their two-dimensional counterparts, i.e. skyrmions, hopfions appear anything but ubiquitously in experiments. One reason is the lack of proposals for efficient ways to create these complex magnetic textures. Recently, ideas emerged for the creation of skyrmion-antiskyrmion pairs in two dimensions [1]. We generalize this idea to three dimensions. Using micromagnetic simulations, we show that spin-polarized currents can create hopfions at defects, similar to blowing smoke rings.
[1] K. Everschor-Sitte et al., New J. Phys. 19, 092001 (2017)