Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Magnetic Nanoparticles
MA 38.11: Vortrag
Donnerstag, 19. März 2015, 12:15–12:30, H 0110
X-ray magnetic circular dichroism of free iron and cobalt dimer cations — •Vicente Zamudio-Bayer1,2, Konstantin Hirsch2, Arkadiusz Ławicki2, Andreas Langeberg2, Akira Terasaki3,4, Bernd von Issendorff1, and Tobias Lau2 — 1Physikalisches Institut, Universität Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg, Germany — 2Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 3Cluster Research Laboratory, Toyota Technological Institute, 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan — 4Department of Chemistry, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
Only recently was it possible for the first time to measure the x-ray magnetic circular dichroism (XMCD) of small, free, size selected clusters. This achievement opens up new possibilities to better understand how spin coupling and orbital magnetic moment in 3d transition metals develop from the isolated atom to the bulk material. With this in mind, we have now measured the XMCD of free iron and cobalt dimer cations. The high complexity of the electronic structure of these smallest molecules is evidenced by the numerous attempts in the literature to theoretically describe their electronic ground states. By applying the XMCD sum rules it is possible to resolve spin and orbital contributions to the total magnetic moment in these molecules and to therefore determine their electronic ground state. Experimental results and possible trends in trimers and larger clusters will be discussed.