Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 37: Atomic clusters
A 37.6: Vortrag
Donnerstag, 15. März 2012, 15:45–16:00, V57.05
Spin Coupling and Orbital Momentum Quenching in Small Iron and Cobalt Clusters — •Andreas Langenberg1,2, Konstantin Hirsch1,2, Vicente Zamudio-Bayer1,2, Markus Niemeyer1,2, Arkadiusz Lawicki2, Marlene Vogel2, Kazuhiro Egashira3, Thomas Möller2, Akira Terasaki3, Bernd von Issendorff4, and Tobias Lau1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Albert Einstein Str. 15, 12489 Berlin — 2Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin — 3Cluster Research Laboratory, Toyota Technological Institute, Ichikawa 272-0001, Japan — 4Universität Freiburg, Fakultät für Physik, 79104 Freiburg, Germany
X-ray magnetic circular dichroism (XMCD) spectroscopy was performed on free and size selected iron and cobalt clusters in a linear penning trap giving direct access to spin and orbital resolved magnetic moments (ms, ml). For iron clusters a quenching of the orbital magnetic moments for already very small clustersizes and an antiferromagnetic coupling of Fe13+ [1] can be observed. Moreover the measured total magnetic moments of the clusters (mj=ml+ms) are in good agreement with results from Stern-Gerlach experiments [2,3]. High resolution XMCD spectra as well as magnetization curves of cobalt and iron clusters will be discussed in detail.
[1] P. Bobadova-Parvanova, K. A. Jackson et.al., Phys. Rev. B 66, 195402 (2002)
[2] X. Xu, S. Yin et.al., Phys. Rev. Lett. 95, 237209 (2005)
[3] M. Knickelbein, Chem. Phys. Lett. 353, 221-225 (2002)