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Abstract: We have investigated the incident polarization dependence of the Co soft X-ray emission spectra for the single- and double-atomic height Co islands grown on the nitrogen-adsorbed Cu(001) surface. For non-resonant incident X-ray in the depolarized configuration, a shoulder structure appeared at the high-energy side of the main peak of the spectra while there is no shoulder in the polarized configuration. The shoulder is attributed to the excitation of correlation satellite originated from the periphery Co atoms of the Co nano-islands. The resonant X-ray emission spectrum in the polarized configuration with the excitation energy of the absorption peak shows a peak located at the high-energy side of the main peak. This additional peak was not observed in the depolarized configuration. [ABSTRACT FROM AUTHOR]

Abstract: Growth modes of Co thin films on the both N-saturated and partially N-adsorbed Cu(001) surfaces are studied in detail. From results of the STM and XPS measurements, segregation of N atoms depending on the Co island size is concluded. This new type of atom segregation is explained by means of a lattice strain of the substrate due to the small Co island formation. A novel core-level shift of N1s during the Co film growth is also reported. A possible influence of the lattice strain to the electronic structure of the surfactant is discussed. [Copyright &y& Elsevier]

Abstract: Positioning nanostructures and functional molecules at surfaces and engineering their local coupling behavior is a key challenge in nanotechnology. The recently discovered BN nanomesh on the Rh(111) surface is a potential candidate to combine both properties, templating on the nanometer-scale and electronic decoupling. By means of low temperature scanning tunneling microscopy and spectroscopy experiments we demonstrate this advantageous combination for the case of Co nanoclusters, which can be ordered in a hexagonal nanoarray with a nearest neighbor distance of 3.2nm on the BN nanomesh. The detection of a Coulomb gap of ≈160meV proves the electronic decoupling of the clusters from the rhodium substrate. [Copyright &y& Elsevier]

Abstract: Valence electronic states of mono-atomic layer Co on the nitrogen adsorbed Cu(001) surface are studied by soft X-ray emission spectroscopy. The resonant X-ray emission spectrum can be divided into two components; one is that emitted from the single-layer Co islands and the other is that from more than 2ML thick Co films. The former has a narrower width and a lower binding energy than the latter. These results are in good agreement with the 3d density of states calculated by a first-principles method for single- and double-layer Co films on Cu(001), and clearly demonstrate narrowing of the 3d states in the single-layer. [Copyright &y& Elsevier]