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Diffusion Dynamics of Cux Cluster on Cu(111) Surface |
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| Authors: | ?Jian-feng Tang ?Mai-chang Xu Xue-song Li and Wo-yun Long |
| Institution: | Department of Applied Physics, Hunan Agricultural University, Changsha 410128, China,Department of Maths and Physics, Hunan Institute of Engineering, Xiangtan 411104, China,Department of Applied Physics, Hunan Agricultural University, Changsha 410128, China,Department of Applied Physics, Hunan Agricultural University, Changsha 410128, China |
| Abstract: | The diffusion dynamics of small two-dimensional atomic clusters Cux (1·x·8) on Cu(111) surface were studied using the molecular dynamics simulations and a modified analytic embedded-atom method in the temperature range from 200 K to 800 K. The cluster size and temperature dependence of the diffusion coefficients and migration energies are presented. Our simulations show that the diffusion migration energy of the Cu7 cluster is the highest and the prefactor for the Cu7 cluster is almost three orders of magnitude larger than that for single atom diffusion. This conclusion is consistent with the experimental results for similar metals. In addition, the dependence of cluster diffusion on film growth is also discussed. |
| Keywords: | Cluster Molecular dynamics Surface diffusion |
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