In this paper, nanoparticles of M- type strontium hexaferrite doped with cobalt SrFe12-xCoxO19 (x= 0-2) were synthesized via sol– gel technique. Structural and morphological properties of the samples were analyzed by X- ray diffraction (XRD), Fourier transform infrared spectroscopy (FT- IR) and scanning electron microscopy (SEM). The XRD results showed that all of the samples of