SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Posters Magnetism III
MA 11.25: Poster
Wednesday, September 29, 2021, 13:30–16:30, P
Anisotropy of 4f states in 3d-4f single molecular magnets — Andreas Rauguth1, Ahmed Alhassanat1, Hebatalla Elnaggar3, Angeliki A. Athanasopoulou1, Chen Luo2, Hanjo Ryll2, Florin Radu2, Torge Mashoff1, Frank M.F. de Groot3, Eva Rentschler1, and •Hans-Joachim Elmers1 — 1Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany — 3University Utrecht, Utrecht, Netherlands
Using X-ray magnetic circular dichroism, we determined element-specific magnetic moments in 3d-4f metallacrown single molecular magnets at low temperature (7 K) and large field (7 Tesla). The magnetic moment of the molecule is dominated by the rare earth moment revealing a large contribution of orbital moment. Angular-dependent spectra on oriented molecules in single crystals allow to disentangle magnetic and orbital anisotropies. X-ray natural linear dichroism reveals the anisotropic charge distribution of the rare earth 4f state in the tetragonal crystal field despite the small 4f crystal field splitting. The angular dependence of the spin and orbital magnetic moments are compared to theory using multiplet calculations. We determined magnetic anisotropies from the angular dependence of the orbital magnetic moment.