Hetero-diffusion of small clusters on Ag(111) surface
Laboratoire de Physique de la Matière Condensée, Faculté des Sciences Ben M’sik, Hassan II University of Casablanca, B. P. 7955, Casablanca, Morocco
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Accepted: 5 June 2018
Published online: 24 July 2018
The investigation reported in this paper is an attempt to analyze and understand the hetero-diffusion of small clusters on the (111) surface of Ag. This work has been realized using molecular statics simulations based on semi-empirical many body potentials described by the embedded atom method. For this study, we have considered three heterogeneous systems Cun/Ag(111), Agn/Ag(111) and Aun/Ag(111), where n is the number of cluster atoms (n = 1 , 2, 3, 4 or 5). Our findings show that the clusters diffuse on the (111) surface via two different diffusion processes, namely the zigzag motion and the concerted jump. Moreover, the activation energy increases from adatom, dimer, to trimer, and goes down at tetramer, and then rises again for pentamer. This behavior is similar for the three systems under study and also to the one obtained by the density-functional theory for the homogenous systems.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2018