Berlin 2005 – scientific programme
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MA: Magnetismus
MA 28: Magnetische Partikel/Cluster I
MA 28.3: Talk
Tuesday, March 8, 2005, 15:45–16:00, TU H1028
Temperature Dependence of Magnetic Properties of Small Ferromagnetic Clusters — •Svetlana Polesya1, Sven Bornemann1, Jan Minár1, Hubert Ebert1, and Ondrej Šipr2 — 1Dept. Chemie und Biochemie, Universität München, Butenandtstr. 5-13, D-81377 München, Germany — 2Institute of Physics Acad. of Sci. of the Czech Republic, Cukrovarnicka 10, Praha 6 162 53, Czech Republic
The temperature dependence of the magnetic properties of small ferromagnetic clusters has been studied within the extended classical Heisenberg model using Monte-Carlo simulations. The exchange coupling constants were obtained from ab initio spin-polarized KKR calculations of the electronic structure. Results of calculations for Co clusters both unsupported and deposited on Pt(111) surface will be presented. In particular the influence of the spin-orbit induced anisotropy on their thermodynamic properties will be discussed. The peculiarities of the cluster electronic structure lead to a nonmonotonical size dependent Curie temperature for small Fe, Co and FePt clusters. The use of exchange coupling constants taken from bulk calculations on the other hand results in a monotonous increase of the Curie temperature.