Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2

O 71.6: Talk

Thursday, September 8, 2022, 16:30–16:45, S051

Spin excitations on hexagonal zinc oxide — •Lukas Arnhold, Henrik Lichtl, Leon Rullkötter, Nicolaj Betz, Susanne Baumann, and Sebastian Loth — University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany

Few-layer materials are widely used to tailor different electronic properties, down to the atomic level. We use a double layer of ZnO, a hexagonal wide bandgap semiconductor [1], to mitigate electron scattering between the Ag (111) substrate and Co atoms deposited on the ZnO surface. With low-temperature scanning tunneling microscopy we observe spin excitations and the ability to manipulate transition metal atoms on the surface into hexagonal arrangements. These findings make ZnO a viable candidate for resonant spin spectroscopy methods [2,3] and construction of geometrically frustrated magnetic structures.

[1] A. Shiotari et al., J. Phys. Chem. C 118, 27428 (2014). [2] S. Baumann et al., SCIENCE 350, 417 (2015). [3] M. Hänze et al., SCIENCE ADVANCES 7, eabg2616 (2021).