Exchange interaction between single magnetic adatoms

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 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.

4 pages, 2 figures, 1 table

References in corpus (7)

• Tunable Non-local Spin Control in a Coupled Quantum Dot System
• Theory of the Fano Resonance in the STM Tunneling Density of States due to a Single Kondo Impurity
• Nonequilibrium theory of scanning tunneling spectroscopy via adsorbate resonances: nonmagnetic and Kondo impurities
• Kondo temperature of magnetic impurities at surfaces
• RKKY and magnetic field interactions in coupled Kondo quantum dots
• Transport spectroscopy of Kondo quantum dots coupled by RKKY interaction
• Exotic Kondo effect from magnetic trimers

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