ISSN:
1432-0630
Keywords:
68.70.+w
;
61.43.Hv
;
68.55.-a
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract We have used variable-temperature scanning tunneling microscopy to study the aggregation of two-dimensional Ag clusters on Pt(111). A transition from randomly ramified to dendritic fractal growth is observed in the diffusion-limited regime. Atomic-scale observations have identified the anisotropy of edge diffusion as microscopic origin of this crossover. Dependent on the deposition flux, this anisotropy is either amplified to the macroscopic-cluster shape and trigonal dendrites result, or it is degenerated and randomly ramified fractals occur. Our study elucidates the close relation between fractal and dendritic pattern formation in diffusion-limited aggregation on a two-dimensional lattice.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01538242
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