DAFS experiments for phase-sensitive determination of local structure around Zr in Co Zr multilayers

Diffraction Anomalous Fine Structure (DAFS) experiments were applied to sup port EXAFS analysis for studying amorphisation behaviour of Co/Zr multilaye rs stimulated by annealing below the crystallisation temperature. The layer s, prepared by electron beam vaporisation, initially polycrystalline, exhib ited hcp structure. The solid state reaction (SSR) during annealing was ind icated by decreasing X-ray reflection intensities. This information and the knowledge of short-range order in Zr crystallites determined by DAFS enabl ed contributions of amorphous and crystalline phases to the average EXAFS s ignals to be separated. DAFS experiments were carried out at the Zr-K absor ption edge using Zr 0002 reflection in symmetric geometry. A strong [0002] fibre texture was observed which did not change during annealing. After mor e than 1 hour annealing at 250 degrees C Co atoms have been detected in the Zr crystallites at a Zr-Co distance of 3.03 Angstrom.