Abstract Polycrystalline Co-Zn nanoferrites doped with rare earth Dy 3+ ions having general chemical formula Co 0.9 Zn 0.2 x Fe 1.9-x O 4 (x = 0.0, 0.015, 0.03, 0.045 and 0.06) were synthesized via sol-gel auto-combustion route. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM) Fourier transform Infrared Spectra (FTIR) performed to investigate the structural, microstructral, su...