MULTIPLE CLUSTER GROWTH OF ULTRA-THIN FILMS WITH ANISOTROPIC EDGE DIFFUSION
Wang Dai-mu (王戴木)a, Wu Zi-qin (吴自勤)b
a Department of Physics, Fuyang Teachers College, Fuyang 236032, China; b Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026, China
Abstract The multiple cluster growth of ultra-thin films on a hexagonal substrate with fractal, dendritic and compact morphology has been studied by computer simulation. The influence of the different diffusion processes along island edges on the island shape has been investigated. The results show that the anisotropic corner diffusion induces the dendritic growth, and the anisotropic step diffusion can promote the anisotropic growth and cause the ramified islands growing in three directions. In the case of compact growth, the island shape is mainly determined by the anisotropic corner crossing process. The nonuniform distribution of the multiple cluster formation can be described quantitatively by multifractal. With patterns changing from fractal to compact islands, the width and height of the bell-like or hook-like multifractal spectra increase, while the top f($\alpha$) decreases.
Received: 24 May 2000
Accepted manuscript online:
PACS:
68.70.+w
(Whiskers and dendrites (growth, structure, and nonelectronic properties))
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