Effect of Annealing Temperature on Structural and Magnetic Properties of Co-Zn Ferrite Nanoparticles

Co-Zn ferrite nanoparticles were prepared using co-precipitation method. The effect of annealing temperature on structure and magnetic properties has been investigated. X-ray diffraction (XRD), transmission electron microscope (TEM), infrared spectroscopy (FTIR), and dynamic light scattering (DLS) were used to characterize the structure of the samples. Magnetic hysteresis loops and zero field cooling ZFC curves, in temperature range (5 – 550 K), were measured using vibrating sample magnetometer (VSM) and the values of blocking temperatures (TB) were determined. The results showed that, all the obtained samples were formed in single spinel phase. The crystallinity enhanced and the particle size increased due to the annealing process with temperatures up to 950oC. Although The lattice parameter, magnetization, and blocking temperature showed minimum values at annealing temperature 350oC, the Curie temperature remained almost constant with annealing temperatures.