Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism I (joint session O/MA)

O 110.2: Talk

Thursday, March 19, 2020, 15:15–15:30, WIL A317

Influence of the Molecular Arrangement on the Magnetic Properties of FePc and FePcF₁₆ thin films — •Katharina Greulich¹, Axel Belser¹, Sven Bölke¹, Reimer Karstens¹, Peter Nagel², Stefan Schuppler², Michael Merz², Thomas Chassé¹, and Heiko Peisert¹ — ¹Institute of Physical and Theoretical Chemistry, University of Tübingen — ²Institute for Solid-State Physics, Karlsruhe Institute of Technology

The electronic configuration and thus the magnetic properties of the central metal atom of some transition metal phthalocyanines are not fully understood and have been intensely debated over the last years. A particularly broad complexity of the electronic structure is expected for Fe(II) phthalocyanines and porphyrins. In our XPS, XAS and XMCD studies, we compare thin films of FePc with their perfluorinated counterpart FePcF₁₆. The results indicate that the magnetic and electronic properties of the central Fe atom depend distinctly on the arrangement of the molecules in thin films. Compared to FePcF₁₆, FePc shows an unusually large XMCD signal at the Fe L_3,2-edge pointing to collective magnetic properties that do not seem possible in FePcF₁₆ due to a different molecular arrangement.