The amine functionalized CoFe₂O₄ nanoparticles were prepared by thermal decomposition method at reflux temperatures 160 °C and 172 °C. The obtained CoFe₂O₄ nanoparticles at 160 °C reflux temperature show aggregation free poly-dispersed nanoparticles in 4-15 nm range. In an elevated reflux temperature of 172 °C, CoFe₂O₄ show aggregated poly-dispersed nanoparticles in the size range of 20-46 nm. The saturation magnetization value at 300 K exhibited 51 emu/g at reflux temperature of 160 °C. However, the sample synthesized at an elevated temperature of 172 °C has shown a coercive field value of 560 Oe with saturation magnetization of 68 emu/g.