InGaGdN single-layer and InGaGdN/GaN superlattice (SL) structures were grown on the MOVPE-grown GaN (0 0 0 1) template substrates by radio frequency molecular beam epitaxy. X-ray diffraction spectroscopy and X-ray absorption fine structure data showed no existence of a secondary phase such as GdN or InN and the Gd atom occupation at the group-III site. Magnetization versus magnetic field curves exhibited clear hysteresis and saturation at both 10 and 300 K. The InGaGdN/GaN SL sample showed higher saturation magnetization per volume than the InGaGdN single-layer sample. (C) 2010 Elsevier B.V. All rights reserved.