Abstract: This review focuses on two systems, nanocrystalline Zn substituted Co1-xZnxFe2O4 (0≤x≥1) and Ni0.4Zn0.2Mn0.4Fe2O4, were synthesized using microwave hydrothermal and auto-combustion method respectively. The synthesized powders were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), thermo-gravimetric-differential thermal analysis (TG-DTA) and FTIR. The average particle size was obtained from TEM and it is found to be 17 nm. Zero field cooled (ZFC) and Field cooled (FC) measurements for Co1-xZnxFe2O4 reveal that samples with 0.6≤x≥1 have superparamagentic behavior at room temperature, which confirms weak interaction between magnetic particles.