Zn1 − xCoxFe2O4 (x = 0−1 in a step of 0.2) nanoparticles with different range of particle size including 5–10 nm and 200–250 nm have been prepared by sol–gel process. Mössbauer spectra at room temperature indicated that, with increasing cobalt content, there is a transition from paramagnetic to magnetically ordered-ferrimagnetic state. Magnetic properties were measured at 300 and 10 K using a Quantum Design MPMS-5S SQUID magnetometer. It was found that with an increase in cobalt content the saturation magnetization and coercivity increase.
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