Exchange interaction between single magnetic adatoms

Details Exchange interaction between single magnetic adatoms Exchange interaction between single magnetic adatoms

2006-11-28

arxiv.org/abs/cond-mat/0611716v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, 1 table

Scientific paper

10.1103/PhysRevLett.98.056601

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 neighbouring adatom spins. Increasing the interatomic distance of a Cobalt dimer from 2.56A to 8.1A 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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