SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Poster: Spins and Magnetism at Surfaces
O 20.10: Poster
Montag, 27. März 2023, 18:00–20:00, P2/EG
Strong exchange interaction between open-shell nanographenes and TbAu2 — •Nicolò Bassi1, Feifei Xiang1, Jan Wilhelm2, Roman Fasel1, and Pascal Ruffieux1 — 1Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland — 2Institute of Theoretical Physics, University of Regensburg, Regensburg, Germany
Rare-earth intermetallic compounds belong to a family of novel substrates, which is becoming a promising platform to control properties of nanomaterials via specific surface-adsorbates interactions. Different combinations, including GdAu2(1), LaAu2(2) and TbAu2(3),have been so far studied. They are all characterized by a ordered hexagonal superstructure with similar lattice constants. Here, we investigate various open-shell nanographenes on TbAu2 alloy by means of STM and STS combined supported by ab inito simulation. For on surface synthesized 7-AGNRs, we find that the predicted spin properties of the end states are indeed conserved on TbAu2. Here, 7-AGNRs are uncharged and the occupied and unoccupied end states have a spin polarization-induced energy splitting of 1.4 eV. In addition, we investigated phenalenyl, the smallest open-shell molecule with spin S = 1/2, at monolayer coverage. Low bias spectroscopy reveals a splitting of the peak of more than 20 mV, which we assign to the exchange interaction between the molecular spin and Tb atoms of the surface layer. These results open new perspectives for studying different open-shell molecules on a magnetic substrate.1 ACS Nano 4, (2010). 2 Phys. Rev. B 88, 125405 (2013). 3 J. Phys. Chem. Lett. 11, (2020).