Ultrafine Co doped γ- Fe2O3 nanoparticles have been synthesized by co-precipitation method and studied the effect of doping on structural, optical and magnetic properties. The XRD results confirm that synthesized material is γ- Fe2O3 nanoparticles, and the particle sizes are 10 and 3.6 nm for 5 and 10 % Co doped samples, respectively. FESEM, TEM and optical characterization reveal decrease in particle size and increase in band gap with increased doping level. Room temperature M-H plots indicate the increase in magnetization (63.7 emu/g for 10 % doped sample) with increasing doping. A small shift towards positive axis is observed in the M-H plots of doped sample. In this paper the correlation between the structural characteristics and observed optical and magnetic properties has been described and discussed.

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