Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.10: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Spin structures in Fe/Rh bilayers on Re(0001) — •Souvik Paul, Stephan von Malottki, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, Christian-Albrechts-Universität zu Kiel, Germany

Transition-metal-superconductor hybrid systems are promising candidates for realizing Majorana bound states, useful for topological quantum computation [1,2]. The prerequisite is a complex spin structure within the transition-metal layer. Here, we study Fe/Rh and Rh/Fe bilayers on Re(0001), a 5d transition-metal substrate with large spin-orbit coupling (SOC) strength which becomes superconducting at T=2.4 K. Previously, it has been shown that Rh/Fe bilayers on Ir(111) can exhibit intriguing spin structures due to the competition of Dzyaloshinskii-Moriya interaction and higher-order exchange interactions [3]. Using density functional theory (DFT), we explore the magnetic phase space by calculating the energy dispersion of homogeneous flat spin spirals with and without SOC and by computing multi-Q states. From our DFT calculations, we parametrize an atomistic spin model which we study using spin dynamics simulations. This allows us to explore complex magnetic structures beyond those studied explicitly by DFT.

[1] H. Kim et al., Sci Adv. 4, eaar5251 (2018).
A. Palacio-Morales et al., arXiv:1809.04503.
N. Romminget al. , Phys. Rev. Lett. 120, 207201 (2018).