Enhancement of the Magnetic Properties of Ni-Cu-Zn Ferrites by the Non-magnetic Al3+-ions Substitution

Abstract

The effect of Al-substitution on the physical, magnetic and electrical properties of Ni-Cu-Zn ferrite of chemical formula Ni 0.4 Cu 0.2 Zn 0.4 Al x Fe 2-x O 4 (x = 0 to x = 0.15 with step = 0.025) which prepared by conventional ceramic method has been studied. X-ray patterns indicated the presence of a single spinel phase. The magnetization is measured using VSM at room temperature. The initial permeability is measured, on toroidal samples used as transformer cores, as a function of temperature at constant frequency of 10 KHz and Curie temperature is determined. It was found that Al-ion substitute improved the magnetization as well as the initial permeability. The dc resistivity is also increased with increasing Alconcentration. Such results are promising ones for the high frequency applications..