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Exchange Interaction between Single Magnetic Adatoms

P. Wahl, P. Simon, L. Diekhöner, V. S. Stepanyuk, P. Bruno, M. A. Schneider, and K. Kern
Phys. Rev. Lett. 98, 056601 – Published 29 January 2007

Abstract

The magnetic coupling between single Co atoms adsorbed on a copper surface is determined by probing the Kondo resonance using low-temperature scanning tunneling spectroscopy. The Kondo resonance, which is due to magnetic correlation effects between the spin of a magnetic adatom and the conduction electrons of the substrate, is modified in a characteristic way by the coupling of the neighboring adatom spins. Increasing the interatomic distance of a Cobalt dimer from 2.56 to 8.1 Å we follow the oscillatory transition from ferromagnetic to antiferromagnetic coupling. Adding a third atom to the antiferromagnetically coupled dimer results in the formation of a collective correlated state.

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  • Received 27 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.056601

©2007 American Physical Society

Authors & Affiliations

P. Wahl1, P. Simon2, L. Diekhöner3, V. S. Stepanyuk4, P. Bruno4, M. A. Schneider1, and K. Kern1,5

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • 2Laboratoire de Physique et Modélisation des Milieux Condensés, Université Joseph Fourier and CNRS, 25 av. des Martyrs, F-38042 Grenoble, France
  • 3Institut for Fysik og Nanoteknologi, Aalborg Universitet, Skjernvej 4, DK-9220 Aalborg, Denmark
  • 4Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
  • 5Institute de Physiques des Nanostructures, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

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Issue

Vol. 98, Iss. 5 — 2 February 2007

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