We have used scanning tunneling spectroscopy and atomic manipulation to study the interaction between a single pair of magnetic atoms at the surface of a nonmagnetic metal. The local electronic structure of cobalt adatoms on Au(111) was measured for different cobalt-cobalt interatomic spacings at T=6 K. Artificially fabricated cobalt dimers are found to show an abrupt disappearance of the Kondo resonance for cobalt-cobalt separations less than 6 Å. This behavior is explained as the result of reduced exchange coupling between gold conduction electrons and ferromagnetic cobalt dimers.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 1 1999|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics