Abstract
Growth of ultrathin films of Cr on Fe(100) has been studied by grazing scattering of 25 keV H + and He + ions from the film surface. We find that growth is epitaxial and pseudomorphic. The first monolayer grows two-dimensionally in a wide range of growth temperatures (300–600 K). For subsequent layers growth proceeds in a layer-by-layer mode at high temperatures; at low temperatures the reduced mobility leads to kinetic roughening. The nucleation length can be manipulated within a factor of 5 by changing growth temperature or deposition rate. This can be exploited to grow almost perfect layers. It is shown that a manipulation of the nucleation length at the beginning of growth has a persisting effect on the growth of further layers.
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