Structural and magnetic properties of Sn and Ti doped Co ferrite

• CoFe2−xMxO4 (M=Sn, Ti; x=0.05) samples crystalize in inverse spinal structure.
• Magnetostriction of Co ferrite is seen to enhance with Ti doping.
• Saturation magnetization of CoFe2O4 is seen to decrease with Sn and Ti doping.
• Anisotropy is seen to decrease with the inclusion of Ti and Sn.

We submit the report on the structural and magnetic studies of Sn and Ti doped cobalt ferrite materials in comparison with the pure CoFe2O4. The XRD result confirms the inverse spinel crystallization of the samples with a space group of Fd-3m. The homogeneity and the stoichiometry of the samples were confirmed with the help of energy dispersive X-ray analysis (EDS). The Raman spectra gave the peaks corresponding to the tetrahedral and octahedral groups. In the case of Sn doping, the right shift of the peaks indicate the presence of massive Sn4+ ion. The effect of the doping of the diamagnetic ions (Ti4+ and Sn4+) is well seen from the reduction of saturation magnetization value from 80 emu/g to 66 emu/g and 61 emu/g respectively. Anisotropy constant (K1) values of all the compounds were calculated employing law of approach method. Values of K1 is found to be 2.16, 1.60 and 1.93×106 erg/cm3 for pure Co ferrite, Sn doped and Ti doped Co ferrites respectively. Saturation magnetostriction (λs) value of pure Co ferrite, Sn doped and Ti doped Co ferrites are −108×10−6, −115×10−6 and −182×10−6 respectively. Considerable enhancement in saturation magnetostriction was observed in the Ti doped Co ferrite. The variation of dλ/dH with applied magnetic field is seen to be less for all the samples, due to the larger crystalline anisotropy of Co2+ ions.