Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Poster: Organic Molecules on Inorganic Substrates

O 31.16: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Towards k-space imaging molecular orbitals on ferromagnetic surfaces — •Martin Anstett, Gregor Zinke, Lu Lyu, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany.

Interfaces between organic molecules and ferromagnets are the key functional units of all molecular spintronic applications. The device functionalities are determined by the details of the strong chemical interactions at the interfaces, which typically lead to strong distortions of the wave functions of the molecular orbitals on the ferromagnetic surfaces.

In this contribution, we present our recent progress in imaging the orbitals of molecules on ferromagnetic surfaces at room temperature by combining spin- and momentum-resolved photoemission spectroscopy and photoemission orbital tomography. The main challenge in this endeavour is the lack of ordered or even aligned molecular films on magnetic surfaces. Using ultrathin cobalt films on Au(111) as a ferromagnetic substrate, we are able to realise long-range self-assembled molecules on this surface. These films show distinct emission patterns for the different molecular orbitals. We will discuss signatures of the strong molecule-surface interaction in the molecular orbital emission pattern.

Keywords: STM; Cobalt; Ferromagnetism; Organic Molecules; Photoemission