Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 3: Bio- and Molecular Magnetism
MA 3.8: Vortrag
Montag, 26. März 2012, 11:30–11:45, EB 202
Direct observation of a ferri-to-ferromagnetic transition in a fluoride-bridged 3d-4f molecular cluster — •Jan Dreiser1, Kasper S. Pedersen2, Cinthia Piamonteze1, Stefano Rusponi3, Zaher Salman1, Md. Ehesan Ali4, Magnus Schau-Magnussen2, Christian Aa. Thuesen2, Stergios Piligkos2, Hoegni Weihe2, Hannu Mutka5, Oliver Waldmann6, Peter Oppeneer7, Jesper Bendix2, Frithjof Nolting1, and Harald Brune3 — 1Paul Scherrer Institut, 5232 Villigen PSI, Switzerland. — 2Dep. of Chemistry, Univ. of Copenhagen, 2100 Copenhagen, Denmark. — 3Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland. — 4Center f. Theoretical Chemistry, Ruhr-Univ. Bochum, 44801 Bochum, Germany. — 5Institut Laue-Langevin, 38042 Grenoble, France. — 6Physikalisches Institut, Univ. Freiburg, 79104 Freiburg, Germany. — 7Dep. of Physics and Astronomy, Uppsala Univ., 751 20 Uppsala, Sweden.
We report on a X-ray magnetic circular dichroism (XMCD) study of the novel fluoride-bridged molecular nanomagnet DyCrDy. Element-specific magnetization curves allow us to directly observe the field-induced transition from a ferrimagnetic to a ferromagnetic arrangement of the Dy and Cr magnetic moments. By fitting a spin-Hamiltonian model to the XMCD data we extract the strength of the Dy-Cr exchange coupling. The value found from XMCD is consistent with SQUID magnetometry and inelastic neutron scattering measurements. Furthermore, based on this approach we investigate other 3d-4f molecular nanomagnets.