SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 13: PhD Focus Session: Symposium on Strange Bedfellows - Magnetism Meets Superconductivity" (joint session MA/AKjDPG) (joint session MA/TT)
MA 13.2: Talk
Thursday, September 30, 2021, 10:30–10:45, H5
Magnetic exchange interactions at proximity of a superconductor — •Uriel Aceves1,2, Sascha Brinker1, Filipe Guimaraes3, and Samir Lounis1,2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany — 2Faculty of Physics, University of Duisburg-Essen, 47053 Duisburg, Germany — 3Jülich Supercomputing Centre, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany
The coupling of magnetic impurities to superconductors prompts the arise of exciting physics such as sub-gap states like Yu-Shiba-Rusinov states and Majorana zero modes, which constitute key mechanisms on the road towards a topological quantum computer. The interplay of spin-orbit coupling and (non-collinear) magnetism enriches the complexity and topological nature of the in-gap states hosted in proximity-induced superconductors. However, little is known about the impact of superconductivity on the different contributions to the magnetic exchange interactions, like the bilinear isotropic exchange and the Dzyaloshinskii-Moriya interaction — and in turn the impact on the magnetic textures. In this work, we propose a method for the extraction of the tensor of exchange interactions in the superconducting regime as described by the Bogoliubov-de Gennes equations. Finally, with our multi-orbital tight-binding code TITAN, we investigate a Mn (110) monolayer deposited on the Nb (110) surface and analyze the magnetic interactions of the superconducting and metallic phases.
–Work funded by Horizon 2020–ERC (CoG 681405–DYNASORE).