Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 61: Skyrmion Dynamics

MA 61.3: Vortrag

Freitag, 24. März 2017, 10:00–10:15, HSZ 401

Motion of higher-order skyrmions driven by spin-orbit torques — •Ulrike Ritzmann1, Stephan von Malottki2, Joo-Von Kim3, Karin Everschor-Sitte1, Jairo Sinova1, Stefan Heinze2, and Bertrand Dupé11Johannes Gutenberg Universität Mainz, Mainz, Germany — 2Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 3Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Orsay, France

Skyrmions are topologically stabilized spin structures on the nanometer scale. 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 also occur in ultra-thin transition metal films at surfaces [1,2] and interfaces [3].

We have shown previously that skyrmions exist in these systems due to a competition between magnetic interactions beyond the first nearest neighbour approximation. We have found that this competition can stabilize higher order skyrmions in Pd(fcc)/Fe/Ir(111) such as antiskyrmions (S=-1) and higher order antiskyrmions (S=-2) [4].

Here, we present a study on the motion of these skyrmions via spin transfer torques. The displacement of skyrmions can be described in a rigid-body approximation [5], whereas the motions of antiskyrmions require to take internal degrees of freedom into account.

[1] Romming et al., Science 341, 636 (2013); [2] B. Dupé et al., Nat. Commun. 5, 4030 (2014); [3] B. Dupé et al., Nat. Commun. 7, 11779 (2016); [4] B. Dupé et al., New J.Phys. 18, 055015 (2016); [5] Thiele, Phys. Rev. Lett. 30, 230 (1973)

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