Abstract
Cu 0.7Cd 0.3Al t Fe 2− t O 4 ( t = 0, 0.05, 0.1,…,0.3) ferrites were prepared by standard ceramic method to investigate the lattice parameter, grain size, magnetization and initial permeability variations as a function of Al 3+. Decrease of lattice parameter with Al 3+ addition is related to the ionic sizes of the cations. The magnetization is governed by three sublattice model. Temperature variation of susceptibility shows that these ferrites contain a mixture of SD and MD grains. The initial permeability follows the Globus model. The decrease in μ i is attributed to a decrease in grain size and increase in K 1. Al 3+ substitution causes impedence to the domain wall motion.
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