Unirradiated and irradiated nano spinels (CoCo0.5Al1.5O4, Co3O4) were prepared. All investigated samples were characterized
using different techniques such as X-ray diffraction (XRD), Fourier-transform infrared (FTIR) analysis, thermal gravimetric
analysis (TG), and transmission electron microscope (TEM). XRD and FTIR analyses confirmed the formation of spinel structure
in addition to the effect of gamma radiation on the crystalline structure of unirradiated nano spinels. TG analysis showed that the
irradiated nano spinels have more thermal stability than unirradiated ones. As an obvious effect of gamma radiation on structure,
the irradiated nano spinel sample showed a different particle morphology compared to the unirradiated one. An obvious
enhancement of both electrical and magnetic properties was observed for the irradiated nano spinel samples. The irradiated nano
spinel sample of cobalt oxide (Co3O4) showed the highest AC conductivity value (2.16 × 10−7 Ω−1 cm−1, at roomtemperature). In
contrast, the irradiated nano spinel sample of cobalt aluminate (CoCo0.5Al1.5O4) showed the highest saturation magnetization
(Ms) value (2.12 emu g −1, at room temperature). All results were collected and discussed.