<span>Magnetic nanoparticles of cobalt ferrite (CoFe<span>2<span>O<span>4<span>) have been synthesized by co-precipitation <span>method with various synthesis temperature and concentration of NaOH. The structural <span>characteristics and particle size of CoFe<span>2<span>O<span>4 <span>were determined by X-ray diffraction (XRD) and <span>Transmission Electron Microscopy (TEM), its showed that nanoparticles well crystallized with <span>various grain size which depend on synthesis parameters. The grain sizes estimated using the <span>Scherrer formula were found that the grain size increased with increasing temperature <span>synthesis and decreasing concentration of NaOH. Magnetic characterization of CoFe<span>2<span>O<span>4 <span>nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample <span>with various concentration of NaOH showed that coercivity was decrease with the decrease of <span>particle size. In other hand, samples with various synthesis temperature found that sample with<br /><span>smallest grain size have high coersivity. The saturation magnetization increase when <span>crystallinity increase. Based on the results, it can be concluded that magnetic characterization <span>of CoFe<span>2<span>O<span>4 <span>was influenced by grain size and crystallinity.</span></span></span></span></span></span></span></span></span></span></span></span><br /></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
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