Complex permeability studies of Li1+ substituted Cu-Zn ferrites
Authors: Suryavanshi, S.; Kabbur, S.; Deshmukh, U.; Sawant, S.
Source: Journal of Electronic Materials, Volume 29, Number 7, July 2000 , pp. 979-983(5)
Abstract:Compositions having the general formula Zn0.5Cu0.5−tLi2tFe2O4, where t=0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, and 0.1, have been synthesized by using coprecipitation techniques using oxalate precursors. The initial permeability was calculated from the inductance measurements with a torroidal core of 100 turns, using the formula L=0.0046 i N2 h log d2/d1. There is a decrease in initial permeability (i) with the substitution of Li1+ ions which is explained on the Globus model. The values of rotational permeability (rk) and w have been calculated. In all the compositions, the main contribution to the initial permeability is due to domain wall motion. With addition of Li1+ ions the wall permeability w decreases, which suggest that these ions cause impedance to the domain wall motion. The frequency variation of ′ and ″ clearly indicate the low-frequency dispersion which may be attributed to the domain wall movements. From the L.F. studies it is concluded that the losses are minimum in the frequency region of 10 KHz to 1 MHz as expected for lithium ferrites.
Document Type: Research Article
Publication date: July 1, 2000