| ATOMIC AND MOLECULAR PHYSICS |
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Diffusion of Six-Atom Cu Islands on Cu(111) and Ag(111) |
| Sardar Sikandar Hayat1**, I. Ahmad1, M. Arshad Choudhry2
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1Department of Physics and Astronomy, Hazara University, Mansehra 23100, Pakistan
2Department of Physics, The Islamia University of Bahawalpur, Bahawalpur 63120, Pakistan
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| Cite this article: |
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Sardar Sikandar Hayat, I. Ahmad, M. Arshad Choudhry 2011 Chin. Phys. Lett. 28 053601 |
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Abstract Diffusion of Cu hexamer islands on Cu(111) and Ag(111) is studied using a molecular dynamics simulation technique with many-body potentials obtained from the embedded atom method. Simulations are carried out at temperatures 300, 500 and 700 K, showing that shape-changing multiple-atom processes are more helpful for the diffusion rather than concerted motion of islands. Arrhenius plots of the diffusion coefficients provide effective energy barrier values of 161.29±5 meV for Cu(111) and 179.34±5 meV for Ag(111) surfaces. At 700 K, one pop-up atom among island atoms is observed with correlative changes in the position and shape of the lower-layer adatoms.
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| Keywords:
36.40.Sx
68.35.Fx
68.55.A-
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Received: 05 September 2010
Published: 26 April 2011
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| PACS: |
36.40.Sx
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(Diffusion and dynamics of clusters)
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68.35.Fx
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(Diffusion; interface formation)
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68.55.A-
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(Nucleation and growth)
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