Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 70: Poster: Spins on Surfaces & Surface Magnetism
O 70.12: Poster
Mittwoch, 20. März 2024, 18:00–20:00, Poster C
Magnetic adatoms on ultrathin films of the hexagonal insulator ZnO — •Henrik Lichtl1, Lukas Arnhold1, Leon Rullkoetter1, Nicolaj Betz1, Christoph Wolf2, Susanne Baumann1, and Sebastian Loth1 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Center for Quantum Nanoscience, Institute for Basic Science, Seoul, South Korea
Different thin insulating layers can be used to tailor the electronic properties of adsorbed species. We use a double layer of zinc oxide (ZnO), a hexagonal wide bandgap semiconductor[1], to mitigate electron scattering between the Ag (111) substrate and Co atoms deposited on the ZnO surface. Ultrathin zinc oxide (ZnO) forms a honeycomb lattice and a Moiré superlattice on Ag(111). Scanning tunneling microscopy (STM) and density-functional theory (DFT) show that the Co atoms adsorb in the hollow sites of the ZnO hexagons. The atoms can be manipulated laterally with the STM tip. We find different Co entities that range from individual atoms to small nanostructures that feature distinct shape- and magnetic field-dependent spin excitations. This study lays the foundation for further exploration and manipulation of spins on ZnO towards design of frustrated atomic-scale magnetic systems.
[1] A. Shiotari, et al., J. Phys. Chem. C 2014, 118, 47, 27428-27435
Keywords: Scanning tunneling microscopy; Atom manipulation; Spins on surfaces; Density functional theory; 2D material