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- W2202296306 abstract "Thin metal films under ion irradiation undergo morphological modifications that cannot be simply ascribed to atom sputtering. In particular, experimental evidence indicates that for a proper combination of film and substrate materials and ion species and energy, the morphology evolution during bombardment can be considered a dewetting phenomenon [1,2]. In fact, as it happens for liquids [3], and metal films that have been brought to a molten state by laser irradiation [4], the film can dewet from his substrate following two different mechanisms: heterogeneous nucleation and spinodal dewetting. In this paper, we will focus on the former mechanism and we will show how the substrate topography can make it favorable with respect to spinodal dewetting. In particular Atomic Force Microscopy (AFM) has been used to acquire the topography of the substrates used in the dewetting experiments, and these data will be employed in numerical simulations implementing a model where the dewetting is induced by the concurrent and contrasting actions of surface tension and Van der Waals forces on the local molten patches produced by the ion impacts [1]. The resulting simulated dewetted patterns show heterogeneous nucleations as it happens in the experiments whereas simulations employing numerically generated substrates, with the same RMS roughness, but without the characteristic features of real substrates, can only produce patterns of spinodal dewetting." @default.
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- W2202296306 date "2014-03-31" @default.
- W2202296306 modified "2023-09-23" @default.
- W2202296306 title "Substrate topography and heterogeneous nucleations in ion induced dewetting" @default.
- W2202296306 doi "https://doi.org/10.4081/microscopie.2014.5005" @default.
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