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MA: Fachverband Magnetismus
MA 43: Magnetic textures I
MA 43.9: Vortrag
Donnerstag, 15. März 2018, 11:45–12:00, EB 407
Current-driven skyrmion dynamics in ultra-thin magnetic films — •U. Ritzmann1,2, S. von Malottki3, J.V. Kim4, J. Sinova2, S. Heinze3, and B. Dupé2 — 1Uppsala University, Uppsala, Sweden — 2Johannes Gutenberg University Mainz, Mainz, Germany — 3Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 4C2N, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay, France
Skyrmions are topologically stabilized spin structures. They can be manipulated with electric current densities that are orders of magnitude lower than those required for moving domain walls. Especially, isolated magnetic skyrmions can occur in ultra-thin transition metal films at surfaces [1,2] and interfaces [3]. We have shown that skyrmions, antiskyrmions and higher order antiskyrmions exist in Pd(fcc)/Fe/Ir(111) due to a competition between magnetic interactions beyond the nearest neighbour approximation [4].
Here, we present a study on the motion of skyrmions and antiskyrmions via spin transfer torques excited by the spin Hall effect in the substrate. We will show that in general the current-driven motion of these metastable states cannot be described by a rigid body approximation and internal degrees of freedom have to be included. Furthermore, we will describe the different impact of the nature of the DMI on the motion of skyrmions and antiskyrmions [5].
[1] Romming et al., Science 341, 636 (2013); [2] Dupé et al., Nat. Commun. 5, 4030 (2014); [3] Dupé et al., Nat. Commun. 7, 11779 (2016); [4] Dupé et al., New J.Phys. 18, 055015 (2016); [5] Ritzmann et al., in preparation