Diffusion of Six-Atom Cu Islands on Cu(111)and Ag(111)  

作　　者：Sardar Sikandar Hayat I.Ahmad M.Arshad Choudhry 

机构地区：[1]Department of Physics and Astronomy,Hazara University,Mansehra 23100,Pakistan [2]Department of Physics,The Islamia University of Bahawalpur,Bahawalpur 63120,Pakistan

出　　处：《Chinese Physics Letters》2011年第5期99-102,共4页中国物理快报（英文版）

摘　　要：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 700K,one pop-up atom among island atoms is observed with correlative changes in the position and shape of the lower-layer adatoms.

关 键 词：CU(111) method DIFFUSION 

分 类 号：O57[理学—粒子物理与原子核物理]