Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Organic Molecules on Inorganic Substrates II: Mainly Porphyrins

O 15.7: Talk

Monday, March 16, 2020, 16:45–17:00, REC C 213

CoTPP molecules deposited on passivated Fe-(100)-p(1x1)O: a molecular orbital tomography study — •David Janas¹, Henning Sturmeit¹, Iulia Cojocariu², Vitaliy Feyer², Stefano Ponzoni¹, Giovanni Zamborlini¹, and Mirko Cinchetti¹ — ¹Experimentelle Physik VI, TU Dortmund, 44227 Dortmund, Germany — ²Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany

In order to enhance the performances of molecular spintronic devices, a detailed knowledge of the physical properties at the interface is fundamental [1]. In this context molecular orbital tomography (MOT), which combines ab-initio calculations and angle-resolved photoelectron spectroscopy (ARPES), stands out as a powerful and reliable tool to unravel the orbital structure of molecular thin films at metal/organic interfaces [2]. In our work we apply MOT to investigate the interaction of paramagnetic molecules, namely CoTPP, on the passivated Fe-(100)-p(1x1)O surface. Recently, it was shown that the interactions at this interface lead to an emergent magnetic ordering of the molecular layer. Here, we use MOT to further characterize this intriguing system. In particular, we precisely determine the energy level alignment at the interface, the nature of the frontier orbitals, and the azimuthal orientation of the CoTPP molecules with respect to the substrate.

[1] Cinchetti, M., Dediu, V. & Hueso, L. Activating the molecular spinterface. Nature Mater 16, 507-515 (2017) doi:10.1038/nmat4902

[2] Puschnig, P. et al. Reconstruction of molecular orbital densities from photoemission data. Science 326, 702-706 (2009)