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MA: Fachverband Magnetismus

MA 40: Skyrmions III (joint session MA/TT)

MA 40.4: Vortrag

Mittwoch, 18. März 2020, 15:45–16:00, POT 6

First-principles prediction of in-plane magnetic skyrmions: a topological spin-texture for high-storage density — •Flaviano José dos Santos, Markus Hoffmann, Manuel dos Santos Dias, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany

Magnetic skyrmions competitive in information technology should be small to allow a high storage density. However, the dipole-dipole interaction (DDI) effectively impedes the miniaturization of skyrmions embedded in thin films and multilayers with typically out-of-plane magnetization. We predict from first-principles the existence of in-plane magnetic skyrmions in a Co monolayer on W(110). The magnetization of Co exhibits an in-plane easy axis, a geometry in which the DDI contributes to reducing the size of such topological spin textures. We discuss the various properties of these particles and list the mechanisms causing their stabilization. Due to the in-plane easy axis of the magnetization, mirror symmetry is preserved enabling the existence of antiskyrmions being degenerate in energy with skyrmions. This makes Co/W(110) a strong candidate for prospective devices, such as skyrmion/antiskyrmion racetracks [3].
We acknowledge funding from EU Horizon 2020 via ERC-consolidator Grant No. 681405-DYNASORE and DARPA TEE program through grant MIPR (#HR0011831554) from DOI. — Refs.: [1] Vidal-Silva et al., J. Magn. Magn. Mater. 443, 116 (2017); [2] Büttner et al., Sci. Rep. 8, 4464 (2018); [3] Moon et al., arXiv:1811.12552 (2018).