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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Molecular Electronics and Photonics

TT 24.8: Vortrag

Dienstag, 2. April 2019, 11:30–11:45, H22

Proximity effects of a STM tip on the magnetic properties of Fe-porphyrin on Au(111)Laëtitia Farinacci2, •Sumanta Bhandary1, Reecht Gael2, Silke Biermann1, and Katharina Franke21Centre de Physique Théorique, Ecole Polytechnique, 91128 Palaiseau, France — 2Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

We have investigated the adsorption of Fe-porphyrin (FeP) molecules on a Au (111) surface. By means of Scanning Tunnelling Microscopy (STM), we show that the FeP molecules are preferentially adsorbed on the fcc and hcp areas of the surface. Density functional calculations suggest the top-site to be the most stable adsorption site for FeP monomers. The electronic and magnetic features of adsorbed molecules depend largely on the hybridization with the Au surface as well as with the STM tip, and can only be modeled by taking into account the large effective Coulomb interactions, crystal field and spin-orbit coupling at the Fe centre. The tip-molecule, as well as surface-molecule hybridizations are tuned by approaching the STM tip, revealing changes in the magnetic fingerprints of molecules in the STM spectra. Based on density functional theory and many-body theory, we show that the ground state electronic configuration is changed as the tip approaches the molecule, changing the magnetic anisotropy and hence the STM spectra, while the spin state remains unchanged.

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