Multiplet features and magnetic properties of Fe on Cu(111): From single atoms to small clusters

Giulia E. Pacchioni, Luca Gragnaniello, Fabio Donati, Marina Pivetta, Gabriel Autès, Oleg V. Yazyev, Stefano Rusponi, Harald Brune

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The observation of sharp atomiclike multiplet features is unexpected for individual 3d atoms adsorbed on transition-metal surfaces. However, we show by means of x-ray absorption spectroscopy and x-ray magnetic circular dichroism that individual Fe atoms on Cu(111) exhibit such features. They are reminiscent of a low degree of hybridization, similar to 3d atoms adsorbed on alkali-metal surfaces. We determine the spin, orbital, and total magnetic moments, as well as magnetic anisotropy energy for the individual Fe atoms and for small Fe clusters that we form by increasing the coverage. The multiplet features are smoothened and the orbital moment rapidly decreases with increasing cluster size. For Fe monomers, comparison with density functional theory and multiplet calculations reveals a d7 electronic configuration, owing to the transfer of one electron from the 4s to the 3d states.

Original languageEnglish
Article number235426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number23
DOIs
StatePublished - 16 Jun 2015

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