SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Skyrmions III

MA 35.9: Vortrag

Donnerstag, 30. März 2023, 11:45–12:00, HSZ 04

Lifetime of coexisting sub-10 nm zero-field skyrmions and antiskyrmions — •Moritz A. Goerzen¹, Stephan von Malottki^1,2,3, Sebastian Meyer^1,4, Pavel F. Bessarab^2,5, and Stefan Heinze¹ — ¹ITAP, University of Kiel, Germany — ²Science Institute of the University of Iceland, Iceland — ³Thayer School of Engineering, Dartmouth College, USA — ⁴Nanomat/Q-mat/CESAM Université de Liège, Belgium — ⁵Department of Physics and Electrical Engineering, Linnaeus University, Sweden

Localized spin structures such as magnetic skyrmions have raised high hopes for future spintronic devices. For many applications it can be of great advantage to have more than one particle-like texture available. The coexistence of skyrmions and antiskyrmions has been proposed in inversion symmetric magnets with exchange frustration. However, so far only model systems have been discussed and the interplay with the Dzyaloshinskii-Moriya interaction (DMI) has not been studied. Here, we predict that skyrmions and antiskyrmions with diameters below 10 nm can coexist at zero magnetic field in a Rh/Co bilayer on the Ir(111) surface. Based on an atomistic spin model parameterized from density functional theory, we show that the lifetimes of metastable skyrmions and antiskyrmions in the ferromagnetic ground state are above one hour for temperatures up to 75 K and 48 K, respectively. The entropic contribution to nucleation and annihilation rates is different for skyrmions and antiskyrmions. This opens the route to thermal control of coexisting skyrmions and antiskyrmions in frustrated magnets with DMI.