Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 28: Magnetische Partikel/Cluster I

MA 28.4: Vortrag

Dienstag, 8. März 2005, 16:00–16:15, TU H1028

Magnetic moments of Co clusters on Au(111) — •Ján Minár¹, O. Sipr², H. Ebert¹, and V. Popescu¹ — ¹Dep. Chemie, LMU, Butenandtstr. 5-13, 81377 München, Germany — ²Institute of Physics AS CR, Cukrovarnicka 10, Praha, Czech Republic

Generally, magnetic moments of atoms at surfaces and interfaces are larger than magnetic moments of these atoms in the bulk. This property opens a number of interesting topics for fundamental research and has a great potential for industrial applications as well. Recently a lot of experimental effort focused on studying magnetism of Co clusters on Au(111) [1]. These clusters are self-assembled at the elbows of the Au(111) herringbone reconstruction and attain a two-atomic-layers height for a broad range of coverages. In order to assess various contributions to magnetism of these systems, we performed a series of fully relativistic ab-initio calculations of electronic and magnetic structure of Co monolayer and bilayer and of Co_n clusters (n=1-10) on Au(111), employing the spin-polarized tight-binding multiple-scattering formalism [2]. By comparing our theoretical results for different systems one with another and with available experimental data, general conclusions about the nature of magnetism of Co clusters on Au(111) can be drawn.

[1] . A. Dürr et al., Phys. Rev. B 59, R701 (1999); T. Koide et al., Phys. Rev. Lett. 87, 257201 (2001); N. Spiridis et al., Surf. Sci. 507-510, 546 (2002)

[2] R. Zeller et al., Phys. Rev. B 52, 8807 (1995)