Ferromagnetism and spin polarization in indium nitride, indium oxynitride, and Cr substituted indium oxynitride films

•We observe significant room temperature ferromagnetism in indium oxynitride, Cr substituted indium oxynitride, and high quality InN films.•The conducting films show a substantial degree of spin polarization at low temperature.•The presence of magnetism in all samples suggests that intrinsic effects may be responsible for the spin ordering.