Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Skyrmions II (joint session MA/TT/KFM)

TT 37.12: Vortrag

Dienstag, 13. März 2018, 12:45–13:00, EB 301

Prospecting anti-skyrmions in ultra-thin Co films deposited on W(110) — •Flaviano José dos Santos, Bernd Zimmermann, Stefan Blügel, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

Recently, the possibility of anti-skyrmion formation in magnetic films on substrates with low symmetry due to anisotropic Dzyaloshinskii-Moriya interactions (DMI) has been demonstated [1]. Experimentally, such anisotropic DMI has been found for Co-films on W(110) [2]. Motivated by these findings, we investigated from first-principles the tensor of magnetic interactions of films containing up to three layers of Co reconstructed on W(110) surface as a continuation of our previous study [3]. We use the full-potential relativistic Korringa-Kohn-Rostoker Green function method combined with a technique employing infinitesimal rotations to access the different components of the tensor. The anisotropy, magnitude and sign of the interactions are analysed in detail with a focus on the DMI. Using atomistic spin dynamics simulations, we prospect and demonstrate the existence of skyrmions and anti-skyrmions, which depend strongly on the thickness of Co films. Finally, we unveil the spin-wave excitations characterising the topologically distinct skyrmionic objects.

Work supported by the Brazilian agency CAPES (Project No. 13703/13-7) and the European Research Council (ERC-consolidator Grant No. 681405-DYNASORE). [1] Nat. Commun. 8, 308 (2017); [2] Phys. Rev. B 95, 214422 (2017); [3] Phys. Rev. B 95, 134408 (2017).