APPLICATION OF DAFS SPECTROSCOPY TO STUDY THE VARIATIONS OF FE LOCAL-STRUCTURE IN A FE IR(100) SUPERLATTICE/

Superlattice studies are important to synthesise 3d metals in new crys talline structure which may exhibit exotic magnetic properties. The ch allenge is to relate these properties to the details of the chemical g radient and the local strain. We report here on the use of Diffraction Anomalous Fine Structure (DAFS) spectroscopy to separate the XAFS-lik e information about Fe atoms located at different crystallographic sit es of an Fe/Ir(100) superlattice. We obtained the Fe nearest neighbor distances at the Ir-Fe interfaces by the use of a new crystallographic -based analysis of the DAFS data.