Tungsten cluster migration on nanoparticles: minimum energy pathway and migration mechanism D. Chen, W. Hu, F. Gao, H. Deng and L. Sun Eur. Phys. J. B, 80 1 (2011) 31-40 Published online: 09 March 2011 DOI: 10.1140/epjb/e2011-10629-9