Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 46: Poster Organic Molecules on Inorganic Substrates: Electronic, Optical and Other Properties
O 46.6: Poster
Tuesday, March 18, 2025, 18:00–20:00, P2
Momentum space signatures of molecular orbitals on a ferromagnetic surface — •Martin Anstett1, Lu Lyu1, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
The integration of organic molecules with ferromagnetic surfaces is a promising approach to advance spintronic applications. The spin functionalities depend not only on the molecular properties, but also on the energetics and spin polarization of so-called hybrid interface states, which arise due to the hybridization between molecular orbitals and substrate states.
This work focuses on momentum space imaging of the adsorption-induced modification of molecular orbitals on ferromagnetic surfaces at room temperature. This is challenging due to the lack of ordered or aligned molecules on highly reactive magnetic substrates, which is required for momentum space imaging using ARPES. This limitation can be overcome by using ultrathin cobalt films on Au(111) as a ferromagnetic platform. On this surface, we prepare long-range ordered superstructures using iron phthalocyanine molecules. We combine spin- and momentum-resolved photoemission spectroscopy with photoemission orbital tomography to study the characteristic emission pattern of the orbitals of the adsorbed molecules. Our analysis reveals how the molecules arrange on the cobalt surface, producing distinct photoemission signatures associated with individual molecular orbitals.
Keywords: photoemission; ARPES; cobalt; organic molecules; spin