Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 13: Magnetismus
O 13.5: Vortrag
Freitag, 4. März 2005, 16:45–17:00, TU EB107
Evidence for canted spin structures for small mass selected deposited chromium clusters? — •Matthias Reif, Leif Glaser, Michael Martins, and Wilfried Wurth — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg
The magnetic properties of small (N=1..13) CrN clusters deposited on ultrathin Fe films on a Cu(100) substrate magnetized normal to the surface plane have been investigated. To determine the element specific magnetic spin and orbital moments, we have measured X-ray Magnetic Circular Dichroism (XMCD) spectra at the BESSY II storage ring. Soft landing conditions have been used for cluster deposition.
A strong decrease of the spin magnetic moments with increasing cluster size is observed. The spin moments per d-hole decrease from a value of 0.4µB for the monomer down to values of 0.1µB for the Cr13 clusters. The orbital magnetic moments are close to zero for the various cluster sizes except for the Cr4 cluster. Here, an orbital moment coupled antiparallel to the spin moment is observed and the spin moment is strongly enhanced compared to Cr3 or Cr5.
The strong decrease of the spin magnetic moments with increasing cluster size suggests a non collinear alignment of the individual spin moments of the atoms in the larger clusters.
This work was supported by the German ministry for education and research (BMBF) under grant KS1 GUB/5.