Abstract
A global knowledge of adatom diffusion mechanisms on metal fcc(100) surfaces is obtained by a systematic static and molecular-dynamics study based on a series of embedded-atom method potentials. The results suggest that the three kind of (100) surfaces named hard, middle and soft can be distinguished, and we find that the simple exchange mechanisms on the most of surfaces, e.g, hard and most middle surfaces, are in fact by the model of the ``strain induced and relaxed'' instead of the ``concerted motion'' model as expected before. The concerted motion model becomes important only on the soft surfaces. In addition, on the soft surfaces, another kind of complicated exchange mechanism which is different from that based on the strain-induced and relaxed model is observed.
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