Abstract
We have analysed by use of synchrotron radiation induced angle resolved photoemission spectroscopy (PES), Auger electron spectroscopy (AES) and low-energy electron diffraction (LEED) the growth of ultrathin Co layers deposited at room temperature on Pt(111) surfaces. The LEED patterns indicate an incoherent epitaxy and AES data can be explained by a near layer by layer growth mode. Decomposition of the Pt 4f7/2 photoemission line shows characteristic core level shifts for the different environments of Pt atoms, giving insight concerning a relatively sharp interface structure. On the other hand, the Pt/Co interface in the Pt/Co/Pt(111) sandwich is less sharp, giving rise to two Pt surface sites. Annealing of the Co/Pt(111) system at 400 degrees C gives a surface alloy structure with the same symmetry and orientation as the Pt substrate.
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