Exchange interaction between single magnetic adatoms

P. Wahl, P. Simon, L. Diekhoener, V. S. Stepanyuk, P. Bruno, M. A. Schneider, K. Kern

Research output: Contribution to journalArticlepeer-review

167 Citations (Scopus)


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 angstrom 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.

Original languageEnglish
Article number056601
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 2 Feb 2007


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