Magnetic properties of high frequency Ni-Zn ferrites doped with CuO

Cu. substituted Ni-Zn ferrites, with different copper content, were prepare d by a conventional ceramic technique. Structural and magnetic properties o f the ferrites were characterized by X-ray diffraction, scanning electron m icroscopy, frequency dependent power loss, and high frequency (10(6)-10(9) Hz) permeability measurements. These studies revealed that the magnetic per formances increase considerably with the optimum concentration of the addit ions. The contribution of two magnetization mechanisms, domain wall motion and magnetization rotation, on the high frequency complex permeability, is also discussed.