Preparation and magnetic properties of NiFe₂O₄/T-ZnO_W composites

NiFe₂O₄/T-ZnO_W composites were prepaired by encapsulating T-ZnO_W with an NiFe₂O₄ film through ferrite electrodeless plating. The composites were characterized by X-ray analyses (XRD), scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS). The magnetic properties were measured by vibrating sample magnetometer (VSM). The results indicate that the surface of T-ZnO_W is covered with a compact layer of NiFe₂O₄, and the coating on the needlepoint is thinner than that on the root of T-ZnO_W  The composites exhibit excellent ferromagnetic behavior. The saturation magnetization and coercive force increase with the annealing temperature, and reach the peak at 800℃.