Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: CE: Low-dimensional Systems - Materials 3
TT 35.15: Vortrag
Mittwoch, 16. März 2011, 18:00–18:15, HSZ 301
3d-4f molecular nanomagnets investigated by X-ray magnetic circular dichroism — •Jan Dreiser1, Cinthia Piamonteze1, Frithjof Nolting1, Stefano Rusponi2, Harald Brune2, Kasper S. Pedersen3, Jesper Bendix3, and Hoegni Weihe3 — 1Paul Scherrer Institut, Swiss Light Source, CH-5232 Villigen PSI, Switzerland — 2Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland — 3Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
Single-molecule magnets are exchange-coupled spin clusters showing slow relaxation of magnetization. In recent years, efforts have been intensified to increase the magnetization reversal barrier and thus enhance relaxation times by combining rare earth ions with transition-metal ions. Rare-earth ions exhibit very large magnetic anisotropies due to their strong spin-orbit coupling and their mostly unquenched orbital momentum. In this contribution we use X-ray magnetic circular dichroism to observe element-specific magnetization curves. In conjunction with SQUID magnetization and susceptibility measurements, we are able to determine the magnetic coupling between 3d and 4f ions.