High permeability and low power loss of Ti and Zn substitution lithium ferrite in high frequency range

Abstract

The effect of Zn and Ti on the magnetic, power loss and structural properties of Li 0.5Zn x Ti x Mn 0.05Fe 2.45−2 x O 4 ferrites ( x=0.0 to 0.30 in step of 0.05)+0.5 wt% Bi 2O 3, prepared by standard ceramic technique, has been investigated. Complex permeability ( μ*= μ′− jμ″) has been analyzed at room temperature in frequency range from 1 to 10 3 MHz. It was found an enhancement in permeability with Ti and Zn concentration in Li 0.5Zn x Ti x Mn 0.05Fe 2.45−2 x O 4 and exhibits the maximum value 106 for x=0.20 sample. Complex permeability of these ferrites exhibits stable frequency response up to 7 MHz beyond which the real part decreases sharply and imaginary part increases to have a peak at the relaxation frequency. Power loss measurements have been carried out in induction condition ( B=10 mT) in frequency range of 50 kHz to 3 MHz. Power loss has been found to be quite low with the substitution of Ti and Zn in lithium ferrite.