Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 32: Magnetic Particles / Clusters
MA 32.3: Vortrag
Donnerstag, 30. März 2006, 15:45–16:00, HSZ 401
Magnetic and spectroscopic properties of Ru and Mo clusters deposited on Fe(001) and Ni(001) — •Sven Bornemann1, Jan Minar1, Wilfried Wurth2, and Hubert Ebert1 — 1Department Chemie, LMU München — 2Institut für Experimentalphysik, Universität Hamburg
The fully relativistic spin-polarized KKR method has been used to study the magnetic and spectroscopic properties of small Ru and Mo clusters deposited on Fe(001) as well as Ni(001). For both substrates the results for the XMCD spectra and their connection with the spin- and orbital moments will be discussed on the basis of the so-called sum rules.
In line with recent X-ray absorption experiments a pronounced XMCD signal is found for the M2,3-edge of the Ru dimer on Fe(001). However, for a single Ru adatom no XMCD signal is found in the experiment, while theory predicts a dichroic signal and a magnetic moment of 0.84 µB for a single Ru adatom on a Fe(001) surface. In order to understand this contradiction with experiment we also simulated a stepped surface and an incorporation of Ru into the substrate. As it will show, this geometrical situations lead to a strong change in the magnetic moment compared to that of an isolated adatom.