The movement of a patch of Au film on clean (111) surfaces, which occurred when a direct current was fed through the substrate, was investigated by using scanning Auger microscopy. The Au layer exhibited a directional movement towards the anode, in addition to isotropic spreading via surface thermal diffusion. In time, the movement of the over-layer exhibited 3 distinct processes successively. These were: fast isotropic spreading (supplemented by directional movement over an intermediate monolayer), the advance of the foremost over-layer on the anode (at the expense of coverage on the cathode side), and a slow directional movement of the whole layer. The latter produced an oscillatory profile of the Auger peak height on the cathode side. The lateral flux of atoms at the leading edge was 8.1 x 108 and 2.0 x 108/cm-s (for a direct current of 352mA at 596C), respectively, for the latter 2 processes. The corresponding activation energies were 0.77 and 1.2eV. 1990, 231[3], 263-70

Surface Electromigration and Diffusion of Au on Si(111)7 × 7. H.Yasunaga, E.Sasuga: Surface Science,Table 19

Diffusivity of 195Au in Si