Effect of temperature on the magnetic characteristics of Ni0.5Co0.5Fe2O4 nanoparticles

► Crystalline Ni0.5Co0.5Fe2O4 nanoparticles have been synthesized by coprecipitation route. ► Coercivity as a function of temperature shows deviation from the Kneller's law. ► Exchange bias increases with decreasing temperature, followed by a sharp fall below ∼5 K. ► Saturation magnetization follows modified Bloch's law in high temperature range (>100 K). ► The blocking temperature shifts towards the lower values as the applied field increases.