Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Focus Session: Spins on Surfaces II (joint session O/MA)

MA 49.10: Vortrag

Donnerstag, 4. April 2019, 17:30–17:45, H15

Spin excitations in non-collinear magnetic clusters deposited on Pt(111) from TD-DFT — •Sascha Brinker, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich

Small magnetic clusters hold great promise for future information technology. The smallest stable magnetic nanostructure on a metallic surface is a Fe trimer on Pt(111) [1]. The spin stability is strongly influenced by the excitation spectrum and by relativistic effects, like e.g. the Dzyaloshinskii-Moriya-interaction [2], which is among others responsible for non-collinear magnetic ground states. In this contribution, we generalize our time-dependent density functional theory calculations already including the spin-orbit interaction [3,4] to non-collinear magnetic structures, focusing on magnetic clusters on Pt(111). We interpret our results with a generalized Landau-Lifshitz-Gilbert equation. We pay special attention to the anisotropic and non-local contributions to the spin pumping and damping, and to their dependence on the magnetic structure.
This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (ERC Consolidator Grant No. 681405 DYNASORE).
[1] J. Hermenau et al., Nat. Comm. 8, 642 (2017)
[2] J. Hermenau, S. Brinker et al., arXiv:1811.02807 (2018)
[3] M. dos Santos Dias et al., Phys. Rev. B 91, 075405 (2015)
[4] F. S. M. Guimarães et al., Phys. Rev. B 96, 144401 (2017)