Abstract
In this work, we prepared Co1–xMnxFe2O4 (CMFO) ferrites at different levels of doping x = 0.0, 0.1, 0.3, 0.5 and 0.7 using flash auto-combustion method, aiming to obtain promising results more than CoFe2O4 ferrite prepared by other methods. The results show an increase in lattice constant of CMFO with Mn content. In addition, there are many intra-granular pores and significant fusion of the small grains into larger grains. The dielectric properties of CMFO ferrites are enhanced with Mn content. Furthermore, saturation magnetization (MS) and remanent magnetization (Mr) of CMFO are improved slightly with Mn content up to x = 0.1 and then decrease with higher Mn content. The coercivity (HC) of CMFO ferrite decreases with Mn content until it reaches minimum value of 971 Oe for level of Mn substitution x = 0.5; on further Mn content (X = 0.7), it is observed that Hc increases to 1249 Oe. In comparison to previous works, HC (x = 0) and MS and Mr for our sample (x = 0.1) are significantly more than corresponding values obtained for CoFe2O4 ferrite prepared by other methods.