Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)
O 36.54: Poster
Montag, 7. März 2005, 15:00–18:00, Poster TU F
Monte-Carlo studies of nanostructures stabilized by surface-state electrons — •N.N. Negulyaev1, H. Fangohr2, V.S. Stepanyuk3, W. Hergert1, and P. Bruno3 — 1Fachbereich Physik, Martin-Luther-Universität, Halle-Wittenberg, Friedemann-Bach-Platz 6, D-06099 Halle, Germany — 2School of Engineering Sciences, University of Southampton, SO17 1BJ, UK — 3Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
Our studies have shown that new magnetic nanostructures can be stabilized by the long-range interactions between adatoms mediated by surface-state electrons[1,2]. Remarkable expereminets of the group of W.-D. Schneider have demonstrated that cerium adatoms, deposited on Ag(111), can self-assemble into large ordered superlattice via the long-range interaction[3]. Here, we present the Monte Carlo(MC) simulations of the coverage and temperature dependent self-organization of the magnetic adatoms on metal surfaces. The ab initio KKR Green’s function method is used to find parameters of interactions for the MC simulations. We concentrate on Ce adatoms on Ag(111) and Co adatoms on Cu(111).
[1] V.S. Stepanyuk, A.N. Baranov, D.V. Tsivlin, et. al., Phys. Rev. B 68, 205410 (2003).
[2] V.S. Stepanyuk, L. Niebergall, R.C. Longo, et. al., Phys. Rev. B 70, 075414 (2004).
[3] M. Ternes, C. Weber, M. Pivetta, et. al., Phys. Rev. Lett. 93, 146805 (2004).