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O: Fachverband Oberflächenphysik

O 50: Spins on Surfaces at the Atomic Scale IV

O 50.1: Talk

Wednesday, March 29, 2023, 10:30–10:45, REC C 213

Growth and magnetism of ultrathin Fe films on Ta(110) — •Reiner Brüning, Roberto Lo Conte, Kirsten von Bergmann, and Roland Wiesendanger — Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg

The field of hybrid systems, where magnetism and superconductivity are interacting with each other, is a field which is attracting more and more attention in recent years. Spin-polarized scanning tunneling microscopy (SP-STM) is an ideal tool to study the magnetic as well as the superconducting properties and investigate the interplay between each other.
Here, we investigate ultrathin Fe films on the anisotropic (110) surface of the elemental superconductor Ta by SP-STM. For the pseudomorphic Fe monolayer, theory has predicted [1] interesting magnetic ground states depending on the interlayer distance [1], e. g. a magnetic spin spiral with a period of 6 nm.
We observe pseudomorphic growth for sub-monolayer coverage, however, for higher coverage we find several different structures. Two of these three different reconstructions have been observed previously also for Fe on Nb(110) [2]. For the pseudomorphic Fe monolayer on Ta(110), we indeed find a spin spiral with a period of roughly 6 nm as the magnetic ground state at zero field.

[1] L. Rózsa et al., Phys. Rev. B, 91, 144424 (2015) [2] J. Goedecke et al., ACS Nano, 16, 14066-14074 (2022)