Europhys. Lett., 65 (6) , pp. 830-836 (2004)

Lateral nanoscale Fe-Ir superlattices on Ir(100)

A. Klein, A. Schmidt, L. Hammer and K. Heinz

Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg Staudtstr. 7, D-91058 Erlangen, Germany

Abstract
It is shown by scanning tunnelling microscopy (STM) that the Ir(100) surface can be used as a template to form other nanostructures after it
has restructured upon exposure to hydrogen. Extremely long and defect-free Ir nanowires produced in the restructuring process can be
decorated by, e.g., Fe so that FeIrFe nanochains develop as sandwiches of atomically thin Fe and  Ir wires. Laterally they recur with 1.36 nm
periodicity on average, i.e. two atomic rows are missing between two sandwiches. By additional deposition of Fe this space can be filled so
that the vacancy spaced {FeIrFe} lateral superlattice transforms to a {Fe4Ir} superlattice. Their crystallography is determined by quantitative
low-energy electron diffraction (LEED).