Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.100: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Magnetic Structure of GdCu2In — •Martin Rotter1, Mathias Doerr2, Andreas Lindbaum3, Brigitte Beuneu4, Kurt Ziebeck5, and Michael Loewenhaupt2 — 1University of Vienna, Institute for Physcial Chemistry, Austria — 2TU Dresden, Institut für Angewandte Physik (IAPD), Germany — 3Technical University of Vienna, Institute for Solid State Physics, Austria — 4Laboratoire Léon Brillouin, CEA-CNRS, Saclay,France — 5Loughborough University, Department of Physics, U.K.
Gd compounds with nonmagnetic partner elements are attractive probes for evaluating magnetic exchange interactions. The Gd3+ ion has zero angular momentum with a spherical charge density. There is no crystal field interaction, which usually dominates the magnetic properties of rare earth compounds. Special interest deserve the compounds with one atom per primitive unit cell, because the magnetic anisotropy may be calculated from first principles under the assumption, that the classical dipole-dipole interaction dominates. We investigated the magnetic structure of the Heusler compounds GdCu2In by neutron diffraction and find complex antiferromagnetism. Using numerical methods it is possible to interpret the data within the dipolar model. A spin reorientation just below the Néel temperature is predicted.