Speaker
Hilary Masenda
(University of the Witwatersrand)
Description
The spectra for Fe implanted AlGaN show the presence of magnetically-split sextets in the “wings”, similar to features observed in GaN and AlN, attributed to Fe3+ on Al/Ga sites showing slow paramagnetic relaxations. The central part of the spectra is characterised by paramagnetic Fe2+ on Al/Ga sites associated with nitrogen vacancies. However, with Mn doping, the contribution of Fe3+ is considerably reduced or negligible. This is coupled with the corresponding emergence of a single line component with Mössbauer parameters typical of Fe4+ on Al/Ga sites, which are acceptors in AlGaN.
