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The lattice locations and electronic configurations of Fe in 57Co/57Fe implanted ZnO (to (5‐6) × 1014 Fe/cm−2) have been studied by 57Fe Mössbauer emission spectroscopy. The spectra acquired upon room temperature implantation show ∼20% of the probe atoms as Fe2+ on perturbed Zn sites and the remaining fraction as Fe2+ in damage sites of interstitial character. After annealing at 773 K, ∼20% remain on crystalline sites, while the damage fraction has partly disappeared and instead a ∼30% fraction occurs as high‐spin Fe3+, presumably in precipitates. This suggests that precipitation of Co/Fe in ZnO likely takes place at relatively low temperatures, thus explaining some of the discrepancies in the literature regarding magnetic properties of 3d metal‐doped ZnO.
American Institute of Physics
Publication date: 
23 Jan 2012

HP Gunnlaugsson, K Johnston, TE Mølholt, G Weyer, R Mantovan, H Masenda, D Naidoo, S Ólafsson, K Bharuth-Ram, HP Gíslason, Guido Langouche, MB Madsen, Isolde Collaboration

Biblio References: 
Volume: 100 Issue: 4 Pages: 042109
Applied Physics Letters