Due to its different composition, the altered layer of preferentially sputtered alloys has a different lattice constant than the bulk. This lattice mismatch can lead to the formation of dislocations or reconstructions, which have been studied on different cristallographic faces. While a subsurface dislocation network exists on the (111) plane, parallel dislocations are found below the (110) surface. The (100) surface exhibits a shifted-row reconstruction, which is also attributed to the stress induced by lattice mismatch between the bulk and the Pt-enriched surface. The annealing process of the sputtered Pt25Ni75(111) surface is studied in detail by evaluation of the mismatch dislocations and low energy ion scattering data.
Corresponding author: M. Schmid (schmid).