Solid flow drives surface nanopatterning by ion-beam irradiation

Details Solid flow drives surface nanopatterning by ion-beam irradiation Solid flow drives surface nanopatterning by ion-beam irradiation

2012-03-06

arxiv.org/abs/1203.1167v1

Physics

Condensed Matter

Materials Science

12 pages, 4 figures

Scientific paper

Ion Beam Sputtering (IBS) is known to produce surface nanopatterns over macroscopic areas on a wide range of materials. However, in spite of the technological potential of this route to nanostructuring, the physical process by which these surfaces self-organize remains poorly under- stood. We have performed detailed experiments of IBS on Si substrates that validate dynamical and morphological predictions from a hydrodynamic description of the phenomenon. Our results elucidate flow of a nanoscopically thin and highly viscous surface layer, driven by the stress created by the ion-beam, as a description of the system. This type of slow relaxation is akin to flow of macroscopic solids like glaciers or lead pipes, that is driven by defect dynamics.

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