Enhancement in Dielectric and Magnetic Properties of Substituted Ni-Zn Nano-Ferrites by Coprecipitation Method

Indium substituted nano nickel zinc ferrites Ni_0.5Zn_0.5In_xFe_2-xO₄ with x=0, 0.1, 0.2 and 0.3 are synthesized by a coprecipitation method. Magnetic and dielectric properties are studied over a frequency range 1-30 MHz. Initial permeability is found to be in the range of 9-19 with a magnetic loss tangent of 10^-1-10^-2 . The dielectric constant is noticed in the range of 11-17 along with low dielectric loss tangent (10^-1-10^-3). The composition with x=0.2 is found to have the highest specific saturation magnetization of 78.8 emu/g. Appreciable dielectric and magnetic values along with low losses can be correlated to small grain size and better compositional stoichiometry obtained as a result of processing by coprecipitation method. These fascinating dielectric and magnetic properties of these materials reveal a direction for high-frequency applications.