Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.90: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Monte Carlo Simulation of Temperature Dependence of Magnetic Properties of Small Metall Clusters — •Svitlana Polesya and Hubert Ebert — Dept. Chemie/Phys. Chemie, Universität München, Butenandtstr. 5-13,
D-81377 München, Germany
Temperature dependent magnetic properties of small clusters of 3d-elements and their compounds both unsupported and deposited on metallic surfaces have been studied using MC simulations together with the extended Heisenberg model. The exchange parameters of the systems under consideration have been obtained from ab initio spin-polarized KKR calculations of electronic structure. It is shown that the temperature TC of a transition from magnetically ordered to a disordered state for clusters consisting of few atoms is strongly determined by the magnetic anisotropy of the system. The dependence of TC on the cluster size is analyzed and compared to the value obtained for an infinite crystal.