Ni1-xCuxFe2O4 nanoparticles were successfully synthesized by a microwave-induced combustion process using urea as fuel. The XRD study confirmed the formation of a single-phase of cubic spinel Ni-Cu ferrite at low copper content. However, CuO is identified as a minor phase for x>0.15. Room temperature magnetization results showed that the magnetization increases and the coercivity decreases with increasing copper content.
