A comprehensive study of the structural, magnetic and optoelectronic behavior of Ni0.6Mn0.4Cr2O4 chromite for magneto optical devices

Chromium-based spinel oxides have recently gained popularity in commercialisation field owing to its suitability in optoelectronic applications. Pure phase Ni0.6Mn0.4Cr2O4 spinel chromite nanopowder with a cubic structure and (Fd3m) space group was successfully synthesised via the sol gel route. Magnetic and optical characterisation were performed by the vibrating sample magnetometry (VSM) and UV–Visible spectrophotometer leading to determine some intrinsic parameter such us Curie Temperature (TC) and optical band gap energy (Eg). The thermal variation of magnetization at a field of 150 Oe gives rise to a magnetic phase transition from the ferrimagnetic state to the paramagnetic one at a Curie temperature of 47 K. The M − H hysteresis loop carried out at 5K gives rise to hard ferrimagnetic behaviour of the studied sample with coercive field of 9967.72 Oe confirming its suitability in the permanent magnet manufacturing. The spectral behaviour of absorption gives rise to a broad visible absorption as well as direct optical gap of 2.14 eV. The refractive index, the optical dielectric constants as well as the non-linear behaviour of the studied compound were discussed. The outstanding results definitely present a high path to significant magneto-crystalline anisotropy as well as powerful luminous efficiency of Ni0.6Mn0.4Cr2O4 making it suitable for the manufacture of devices that combine various optical and magnetic properties.