Enhancement in Dielectric and Magnetic Properties of ${\rm In}^{3+}$ Substituted Ni-Zn Nano-Ferrites by Coprecipitation Method

Indium substituted nano nickel zinc ferrites Ni
_0.5
Zn
_0.5
In
_x
Fe
_2-x
O
₄
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.