Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.38: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
First-principles local interactions extracted from non-collinear magnetic states — Miklós Salánki1, Bendegúz Nyári1, András Lászlóffy2, and •László Szunyogh1 — 1Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary — 2Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungary
The local Dzyaloshinskii-Moriya interactions (DMI) derived from first principles in non-collinear magnetic configurations in the absence of spin-orbit coupling [1] became recently the subject of an intense discussion [2,3,4]. On the one hand, the local DMI has been explained due to charge and spin currents emerging in non-collinear spin-configurations [1,3], on the other hand, it was shown to be a consequence of fourspin (or higher-order multispin) interactions [2].
As in Ref. [1] we perform calculations of the local interaction parameters for a Cr trimer on Au(111) in terms of the multiple scattering Green’s function technique. We use two alternative formalisms that lead to different local parameters. We show that this ambiguity occurs due to longitudinal terms in the corresponding expressions. We find that the formalism based on the structural Green’s-funtion matrices provides local interactions being consistent with a spin model including fourspin interactions calculated on the same basis.
[1] R. Cardias et al., arXiv:2003.04680; Sci. Rep. 10, 20339 (2020).
[2] M. dos Santos Dias et al., Phys. Rev. B 103, L140408 (2021).
[3] R. Cardias et al., Phys. Rev. B 105, 026401 (2022).
[4] M. dos Santos Dias et al., Phys. Rev. B 105, 026402 (2022).