Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 5: Magnetic Nanostructures
O 5.1: Talk
Monday, February 25, 2008, 11:15–11:30, MA 043
Probing the surface states of single atoms on cobalt nanoislands — •Laurent Limot1, Benjamin Heinrich1, Mircea-Vasile Rastei1, Cristian Iacovita1, Pavel A. Ignatiev2, Valeri S. Stepanyuk2, Patrick Bruno2, and Jean-Pierre Bucher1 — 1Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Université Louis Pasteur, F-67034 Strasbourg, France — 2Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle/Saale, Germany
With the remarkable downscaling of data-storage bits, both writing and reading processes become extremely challenging, since read sensors need to be comparable to the bit size, and at the same time, their sensitivity must be improved due to the loss in signal-to-noise ratio. Future progress strongly relies on our fundamental understanding of magnetic phenomena in reduced dimensions.
Atoms on magnetic nanoislands represent a model playground for investigating such phenomena. In this study, we focus on the electronic properties of single Ni, Cu and Co atoms adsorbed on cobalt nanoislands grown on the Cu(111) surface. By combining low-temperature scanning tunneling spectroscopy with ab initio calculations we reveal the existence of a common electronic resonance, resulting from the localization of the nanoisland surface states at the adsorption site of the atoms.