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|Title:||Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57Mn+ implanted GaN and AlN||Authors:||Masenda, Hilary
Mølholt, Torben Esmann
|Keywords:||GaN;AIN;Mn;Ion implantation;Emission Mössbauer spectroscopy;Paramagnetism||Issue Date:||Nov-2015||Publisher:||North-Holland Publishing||Source:||Masenda, H. et al. 2016. Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57Mn+ implanted GaN and AlN. Journal of Magnetism and Magnetic Materials. 104: 1130-1138. https://doi.org/10.1016/j.jmmm.2015.11.026.||Abstract:||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 dependence characteristic of a two-phonon Raman process.||URI:||http://hdl.handle.net/10321/2965||ISSN:||0304-8853|
|Appears in Collections:||Research Publications (Applied Sciences)|
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