Magnetism and photoluminescence in manganese–gallium oxide nanowires with monoclinic and spinel structures

Manganese–gallium oxide nanowires were synthesized via in situ Mn doping during nanowire growth using a vapor phase evaporation method. The microstructure and composition of the products were characterized via transmission electron microscopy (TEM), field emission scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy. The field and temperature dependence of the magnetization reveal the obvious hysteresis loop and large magnitude of Curie–Weiss temperature. The photoluminescence of the manganese–gallium oxide nanowires were studied in a temperature range between 10 and 300 K. A broad green emission band was observed which is attributed to the 4T1–6A1 transition in Mn2+(3d5) ions.