Multiparticle biased diffusion-limited aggregation with surface diffusion:A comprehensive model of electrodeposition

We present a complete study of the multiparticle biased diffusion-limited a ggregation (MBDLA) model supplemented with surface diffusion (SD), focusing on the relevance and effects of the latter transport mechanism. By compari ng different algorithms, we show that MBDLA + SD is a very good qualitative model for electrodeposition in essentially the whole range of current inte nsities provided one introduces SD in the model in the proper fashion. We h ave found that the correct procedure involves simultaneous bulk diffusion a nd SD, introducing a time scale arising from the ratio of the rates of the two processes. We discuss in detail the different morphologies obtained and compare them to the available experimental data with very satisfactory res ults. We also characterize the aggregates thus obtained by means of the dyn amic scaling exponents of the interface height, allowing us to distinguish several regimes in the mentioned interface growth. Our asymptotic scaling e xponents are again in good agreement with recent experiments. We conclude b y discussing a global picture of the influence and consequences of SD in el ectrodeposition.