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AM: Magnetismus
AM 18: Oberfl
ächenmagnetismus II
AM 18.8: Vortrag
Donnerstag, 25. März 1999, 16:30–16:45, F5
Spin and orbital magnetization in self-assembled Co clusters on Au(111) — •H.A. Dürr1, S.S. Dhesi1, E. Dudzik1, D. Knabben2, G. van der Laan1, F.U. Hillebrecht2, and J. Goedkoop3 — 1Daresbury Laboratory, Warrington, WA4 4AD, UK — 2Institut für Angewandte Physik, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany — 3ESRF, BP 220, 38043 Grenoble, France
Co clusters grown on a Au(111) surface represent a structurally well characterized model system to study the influence of finite size effects and reduced dimensionality on electronic and magnetic properties. Orbital and spin magnetic moments were determined using magnetic circular x-ray dichroism. The orbital moment is a measure of the 3d electron hybridization and directly linked to magnetic properties such as the magnetocrystalline anisotropy. We show that superparamagnetic Co/Au(111) clusters exhibit a strong variation in perpendicular magnetic anisotropy with cluster size which can be ascribed to electron localization at the perimeter of the clusters. The reduced dimensionality of such sites leads to drastic changes in the 3d electronic structure resulting in an increased orbital magnetic moment and a temperature dependent 3d band occupancy.