Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-02-10
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 3 figures
Scientific paper
Ultrathin MgO films on Mo(100) with a thickness up to 12 ML are studied by scanning tunneling microscopy and spectroscopy at room temperature. The spatial variation of the work function within the MgO film is mapped by field emission resonance states (Gundlach oscillations) using dz/dU spectroscopy. We found circular spots with significantly reduced work function (DeltaPhi=0.6 eV), which are assigned to charged defects within the MgO film. On top of the MgO films, small Co cluster are deposited with an average contact area of 4 nm^2. These islands exhibit Coulomb oscillations in dI/dU spectra at room temperature. Good agreement with orthodox theory is achieved showing variations of the background charge Q_0 for islands at different positions, which are in accordance with the work function differences determined by the Gundlach oscillations.
Grob Matthias
Morgenstern Marcus M.
Pauly Christian
Pezzotta M.
Pratzer M.
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