Preferential sputtering of Pt-Ni alloy single crystals studied by scanning tunneling microscopy

M. Schmid, A. Biedermann, C. Slama, H. Stadler, P. Weigand and P. Varga

Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria

Nucl. Instrum. Methods in Phys. Res. B 82 (1993) 259-268

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.

Part of this work is on display in the IAP/TU Wien STM Gallery (see the dislocations page).

Corresponding author: M. Schmid (schmid< encoded email address >).