Abstract
We have investigated soft landings of Co nanoparticles on clean Cu(001) surfaces. The nanoparticles, {approx}10 nm in size, were generated by dc magnetron sputtering in argon and transferred in the gas stream to an ultrahigh vacuum transmission electron microscope (TEM), where they were deposited on the thin-film substrate. The surface morphology created in this fashion exhibits a unique smoothing mechanism. The nanoparticles do not remain on the surface at temperatures as low as 600 K, but rather reorient and burrow into the substrate. By analyzing the TEM data in combination with molecular dynamics simulations, we were able to study this process in detail and to develop a model to quantify the temperature and cluster size dependence of burrowing.
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