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The lattice sites, valence states, resulting magnetic behaviour and spin–lattice relaxation of Fe ions in GaN and AlN were investigated by emission Mössbauer spectroscopy following the implantation of radioactive 57Mn+ ions at ISOLDE/CERN. Angle dependent measurements performed at room temperature on the 14.4 keV γ-rays from the 57Fe Mössbauer state (populated from the 57Mn β− decay) reveal that the majority of the Fe ions are in the 2+ valence state nearly substituting the Ga and Al cations, and/or associated with vacancy type defects. Emission Mössbauer spectroscopy experiments conducted over a temperature range of 100–800 K show the presence of magnetically split sextets in the “wings” of the spectra for both materials. The temperature dependence of the sextets relates these spectral features to paramagnetic Fe3+ with rather slow spin–lattice relaxation rates which follow a T2 temperature …
Publication date: 
1 Mar 2016

Hilary Masenda, D Naidoo, K Bharuth-Ram, HP Gunnlaugsson, K Johnston, R Mantovan, TE Mølholt, M Ncube, S Shayestehaminzadeh, HP Gíslason, Guido Langouche, S Ólafsson, G Weyer

Biblio References: 
Volume: 401 Pages: 1130-1138
Journal of Magnetism and Magnetic Materials