Magnetism of CoPd self-organized alloy clusters on Au(111)

Magnetic properties of gold-encapsulated CoxPd1-x self-organized nano-clusters on Au(111) are analyzed by x-ray magnetic circular dichroism for x = 0.5, 0.7, and 1.0. The clusters are superparamagnetic with a blocking temperature decreasing with increasing Pd concentration, due to a reduction of the out-of-plane anisotropy strength. No magnetic moment is detected on Pd in these clusters, within the detection limit, contrary to thick CoPd films. Both reduction of anisotropy and vanishing Pd moment are attributed to strain. (C) 2013 AIP Publishing LLC

Mechanisms of CVD diamond nucleation and growth on mechanically scratched Si(100) surfaces

PACS. 81.05.Tp Fullerenes and related materials; diamonds, graphite, 81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, etc.), 82.65.-i Surface and interface chemistry,

Mechanisms of CVD diamond nucleation and growth on mechanically scratched and virgin Si(100) surfaces

The diamond nucleation and growth processes on a scratched and a virgin Si(100) surface were studied by both electron spectroscopies (XPS) and microstructural probes (SEM, TEM) in order to connect the nature of surface species with the structural changes. We have shown that a preliminary scratching of the substrate surface hugely enhances the nucleation kinetics relative to the virgin sample. This is explained by the much faster formation of stable diamond nuclei in correspondence of suitable nucleation sites. The results have been modeled, considering the covered surface S as the unique parameter. S obeys an Avrami plot of the form S= 1 - exp (-kt(n)) where the exponent n approximate to 2.5 +/- 0.4 over a wide range of deposition is indicative of a constant linear growth rate with decreasing nucleation rate. (C) 1997 Elsevier Science S.A

Mechanisms of CVD diamond nucleation and growth on mechanically scratched and virgin Si(100) surfaces

The diamond nucleation and growth processes on a scratched and a virgin Si(100) surface were studied by both electron spectroscopies (XPS) and microstructural probes (SEM, TEM) in order to connect the nature of surface species with the structural changes. We have shown that a preliminary scratching of the substrate surface hugely enhances the nucleation kinetics relative to the virgin sample. This is explained by the much faster formation of stable diamond nuclei in correspondence of suitable nucleation sites. The results have been modeled, considering the covered surface S as the unique parameter. S obeys an Avrami plot of the form S= 1 - exp (-kt(n)) where the exponent n approximate to 2.5 +/- 0.4 over a wide range of deposition is indicative of a constant linear growth rate with decreasing nucleation rate. (C) 1997 Elsevier Science S.A

Kinetics of graphitization of thin diamond-like carbon (DLC) films catalyzed by transition metal Boubiche N., J. El Hamouchi, J. Hulik, M. Abdesslam, C. Speisser, F. Djeffal and F. Le Normand

International audienc