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MA: Magnetismus

MA 28: Magnetische Partikel/Cluster I

MA 28.1: Vortrag

Dienstag, 8. März 2005, 15:15–15:30, TU H1028

Magnetic and spectroscopic properties of deposited transition metal clusters — •S. Bornemann, J. Minár, and H. Ebert — Dep. Chemie, LMU, Butenandtstr. 5-13, 81377 München, Germany

The fully relativistic spin-polarized KKR method has been used to study the magnetic and spectroscopic properties for supported clusters. For a variety of clusters supported on various transition metal substrates it is shown that the magnetic properties depend on several different parameters such as substrate type, cluster size as well as shape etc. This applies especially if one considers properties caused by spin-orbit coupling like the X-ray magnetic circular dichroism (XMCD). In line with recent experimental findings a very pronounced magnetic circular dichroism in X-ray absorption is found for Co-clusters on Pt(111). The results for the XMCD spectra and their connection with the spin, orbital and spin dipolar moments will be discussed on the basis of the so-called sum rules. Furthermore, theoretical results for FePt-clusters on Cu(001), Ag(001) and Au(001) are shown as the bulk material of FePt is well known for having a large magnetic anisotropy.