Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 9: Magnetic Particles, Clusters
MA 9.3: Talk
Monday, March 22, 2010, 15:45–16:00, H23
Spin and orbital moments of small size-selected FePt clusters — •Torben Beeck, Ivan Baev, Kai Chen, Steffen Fiedler, Michael Martins, and Wilfried Wurth — Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
Size-selected FexPty alloy clusters (x,y= 1,2) were deposited in situ under UHV conditions and soft landing. The substrate was a well defined and remanent magnetized Ni thin film evaporated upon a small Cu(100) crystal. The system was investigated in an element specific way at the Fe L2,3 absorption edges by means of x-ray magnetic circular dichroism (XMCD) at the UE52 SGM beamline, BESSY II. Our aim was to determine separately the size and composition dependent spin and orbital moments by applying sum rules.
The results show an increase of the magnetic moments by adding Pt ligands to the Fe cluster. Especially the orbital moment is enhanced.
Because of the limited cluster sizes the experimental results are, in contrast to bigger systems, good candidates for complex theoretical calculations.
This work is supported by the DFG in the framework of the SFB 668 subproject A7.