Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Skyrmions II (joint session MA/TT/KFM)
MA 19.10: Talk
Tuesday, March 13, 2018, 12:15–12:30, EB 301
Antiferromagnetic skyrmion crystals: generation and topological spin Hall effect — •Börge Göbel1, Alexander Mook2, Jürgen Henk2, and Ingrid Mertig1,2 — 1Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle — 2Institut für Physik, Martin-Luther-Universität, D-06120 Halle
Skyrmions are topologically nontrivial, magnetic quasi-particles, that are characterized by a topological charge. A regular array of skyrmions—a skyrmion crystal (SkX)—features the topological Hall effect (THE) of electrons [1,2], that, in turn, gives rise to the Hall effect of the skyrmions themselves.
We present a generally applicable method to create stable antiferromagnetic skyrmion crystals (AFM-SkXs) by growing a two-sublattice SkX onto a collinear antiferromagnet. As an example we show that both types of skyrmion crystals—conventional and antiferromagnetic—exist in honeycomb lattices. While AFM-SkXs do not show a THE, they exhibit a topological spin Hall effect [3]. The zero skyrmion Hall effect carries over to isolated AFM skyrmions as well. They can move in straight lines, at higher velocities and need lower driving currents compared to conventional skyrmions [4,5].
[1] B. Göbel et al., Phys. Rev. B 95, 094413 (2017).
[2] B. Göbel et al., New J. Phys. 19, 063042 (2017).
[3] B. Göbel et al., Phys. Rev. B 96, 060406(R) (2017).
[4] J. Barker et al., Phys. Rev. Lett. 116, 147203 (2016).
[5] X. Zhang et al., Sci. Rep. 6, 24795 (2016).