Speaker
Haraldur Gunnlaugsson
(Aarhus University)
Description
We have implanted 57Co (T½=271 d.) into ZnO single crystals, with the aim of elucidating some controversies in the Mössbauer literature on 57Fe impurities in ZnO. It is shown that some of the data obtained on 57Fe in ZnO has been misinterpreted. The results show that implantation >1E14/cm2 leads to incorporation of ~20% of the probe atoms into distorted substitutional sites, the reminder is found on damage sites of interstitial character. Upon annealing at 773 K (30 min.), the substitutional fraction shows less distortion from the lattice, and part of the interstitial fraction has been mobilized to form precipitates. The results show that magnetic precipitates form easily in transition metal doped ZnO, affecting interpretations of dilute magnetism.
Primary author
Haraldur Gunnlaugsson
(Aarhus University)
Co-authors
Deena Naidoo
(University of the Witwatersrand)
Gerd Weyer
(Aarhus University)
Prof.
Guido LANGOUCHE
(Katholieke Universiteit Leuven)
Hafliði Gíslason
(University of Iceland)
Hilary Masenda
(University of Witwatersrand)
Karl Johnston
(Universitaet des Saarlandes (DE))
Krish Baruth-Ram
(University of KwaZulu-Natal, Durban, South-Africa)
Morten Bo Madsen
(University of Copenhagen)
Roberto Mantovan
Sveinn Ólafsson
(University of Iceland)
Torben Esmann Mølholt
(University of Iceland)
