Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 44: Surface Magnetism (joint session MA/O)
MA 44.6: Talk
Thursday, March 19, 2020, 11:15–11:30, HSZ 101
Growth and Characterization of Thulium-Cyclooctatetraene-Compounds on Gr/Ir(111) with XANES and XMCD — •Lea Spieker1, Alexander Herman1, Benedikt Eggert1, Tobias Lojewski1, Nico Rothenbach1, Stefan Kraus2, Florin Radu3, Chen Luo3,4, Kai Chen3, Fadi Choueikani5, Thomas Michely2, and Heiko Wende1 — 1University of Duisburg-Essen — 2University of Cologne — 3Helmholz Center Berlin for Materials and Energy — 4TU Munich — 5Synchrotron SOLEIL
The magnetic anisotropy and the magnetic coupling of localised 4f elements connected to an organic ligand in a molecular network are a notable point of interest in organic spintronics. We combine the lanthanide thulium (Tm) with the organic molecule cyclooctatetraene (Cot) for the growth of different phases on Gr/Ir(111). Using an undoped substrate Gr/Ir(111) leads the TmCot to self-assemble in a punctiform shape (Dot-phase). On the negatively doped substrate Gr/Eu/Ir(111) TmCot self-assembles in sandwich-molecular wires. As reference, these phases are compared to the metallic sample Tm/Ir(111) which is known to have an electronic configuration of 4f12. The electronic and magnetic properties are analysed by X-ray Absorption Spectroscopy using the methods XANES and XMCD, at temperatures down to 1 K. Angular- and field-depended measurements at the thulium M4,5-edge revealed magnetic anisotropies. By comparison to multiplet calculations the electronic configuration could be determined as 4f12 for the three phases. Financial support by DFG (WE 2623/17-1) is acknowledged.