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MA: Fachverband Magnetismus
MA 4: Bio- und molekularer Magnetismus
MA 4.8: Talk
Monday, March 7, 2016, 11:30–11:45, H33
XAS and XMCD of Dy Complexes on Au(111) — •Matthias Bernien1, Paul Stoll1, Daniela Rolf1, Fabian Nickel1, Qingyu Xu1,2, Claudia Hartmann1, Tobias R. Umbach1, Jens Kopprasch1, Janina N. Ladenthin1, Enrico Schierle3, Eugen Weschke3, Constantin Czekelius4, Katharina J. Franke1, and Wolfgang Kuch1 — 1Freie Universität Berlin, Institut für Experimentalphysik, 14195 Berlin, Germany — 2Department of Physics, Southeast University, 211189 Nanjing, P. R. China — 3Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany — 4Heinrich-Heine Universität Düsseldorf, Institut für Organische und Makromolekulare Chemie II, 40225 Düsseldorf, Germany
Lanthanide complexes are promising candidates for spintronic applications due to their unique magnetic properties like e.g. strong magnetic anisotropy, high magnetic moment, and slow relaxation of magnetization. By means of X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) at T=4.5 K and B=6 T we find that Dy-tris(1,1,1-trifluoro-4-(2-thienyl)-2,4-butanedionate) molecules on Au(111) display an easy-axis anisotropy parallel to the surface. Upon adsorption, the coordination of the Dy3+ ion by its three ligands is deformed due to the interaction with the surface, stabilizing an unusual MJ=15/2 ground state (GS). Due to its cylindrical charge density distribution such a GS is disfavored in the free complex as well as in Dy-bis(phthalocyaninato) complexes where MJ=13/2 GSs are observed. — This work is supported by the DFG through Sfb 658.