Structural and Magnetic Properties of Nano Ferrite for Magnetoelectric Applications

Abstract

Abstract A Series of ferrite samples Ni 0.1 Cu 0.2 Zn 0.7-x Mg x Fe 2 O 4 (where x = 0, 0.15, 0.25, 0.35, 0.45, 0.55 and 0.7) were synthesized using auto combustion flash method. The samples were annealed at 600 °c for 2 hours to eliminate the foreign phases of the constituent nitrate and internal stress. The purity of phase structure was confirmed by x-ray diffraction. Some structural and microstructural parameters like porosity, x-ray density, crystallite size and lattice constant were deduced from x-ray. Scanning electron microscope (SEM) analysis reveals that the grains are separated by pores in all samples and the average grain size decreases with increasing Mg content. Magnetic properties such as coercivity (H c ), saturation magnetization (M s ) and retentivity (M r ) were measured from M-H loops. The magnetization curves were characterized by low coercivity indicating that our samples are soft magnetic material. Both saturation magnetization and coercivity increase by increasing Mg ions where M s reaches maximum value at x = 0.35 then decrease for higher Mg content.