Abstract
Grazing scattering of 25 keV He atoms is applied to study island nucleation and growth of Co on Cu(0 0 1) in real time and real space. With decreasing growth temperature, we observe, starting at 470 K, step-flow growth, layer growth, bilayer growth and, below 210 K, reentrant layer growth. The density of nucleated islands shows a complex “N-shaped” dependence on temperature, which is at variance with standard nucleation theory. Results are explained on the basis of recent density-functional calculations.
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