Self-organized metal nanostructures through laser driven thermocapillary convection

Details Self-organized metal nanostructures through laser driven thermocapillary convection Self-organized metal nanostructures through laser driven thermocapillary convection

2007-04-10

arxiv.org/abs/0704.1179v1

APPLIED PHYSICS LETTERS 91, 043105 (2007)

Physics

Condensed Matter

Materials Science

10 pages, 3 figures

Scientific paper

10.1063/1.2762294

When ultrathin metal films are subjected to multiple cycles of rapid melting and resolidification by a ns pulsed laser, spatially correlated interfacial nanostructures can result from a competition among several possible thin film self-organizing processes. Here we investigate self-organization and the ensuing length scales when Co films (1-8 nm thick) on SiO_{\text{2}} surfaces are repeatedly and rapidly melted by non-uniform (interference) laser irradiation. Pattern evolution produces nanowires, which eventually break-up into nanoparticles exhibiting spatial order in the nearest neighbor spacing, \lambda_{NN2}.The scaling behavior is consistent with pattern formation by thermocapillary flow and a Rayleigh-like instability. For h_{0}\leq2 nm, a hydrodynamic instability of a spinodally unstable film leads to the formation of nanoparticles.

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