Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 19: Teilchen und Cluster II

O 19.3: Vortrag

Dienstag, 9. März 2004, 11:45–12:00, H39

Magnetism of mass selected, deposited, small Gadolinium and Gadolinium oxide clusters — •Matthias Reif, Leif Glaser, Michael Martins, and Wilfried Wurth — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

Results of XMCD (X-Ray Circular Magnetic Dichroism) measurements of small deposited Gadolinium- and Gadolinium oxide clusters are presented. The clusters are supported by a magnetized ultrathin iron film epitaxially grown on Cu(100) and showing an easy magnetization axis perpendicular to the crystal surface. The clusters are generated by high energy sputtering of a Gd-target with Xe-ions. After mass selection using a dipole magnet, the clusters are deposited on the iron surface. In order to prevent fragmentation of the clusters, the process of softlanding is applied. Here, some multilayers of Argon consume the kinetic energy during deposition of the clusters.

Focusing on the 3d→4f and 4d→4f excitations, dichroism spectra measured at beamline UE56/1PGM at BESSYII are shown and different contributions to the dichroism signal are discussed. The different Gdn clusters show similar dichroism patterns as Gd thin films, whereas for the oxidized GdnOm clusters different features are found in the spectra.

This project is supported by BMBF under contract KS1 GUB/5.

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