Magnetization and permeability of polycrystalline ferrites with general formula Cd
xMg
1−xFe
2−yCr
yO
4 (
x=0, 0.2, 0.4, 0.6, 0.8, 1.0;
y=0, 0.05 and 0.10) were studied. Study of saturation magnetization reveals that the Neel's two-sublattice model exists upto
x=0.4, for
y=0, 0.05 and 0.1 and a three-sublattice model (
YK-model) is predominant for
x>0.4 and
y=0, 0.05 and 0.10. The saturation magnetization and magnetic moment were found to decrease with the increase in Cr
3+ contents, which is attributed to the dilution of B–B site interaction. Variation of initial permeability with temperature revealed the long-range ferromagnetic ordering in the compounds with
x=0.4. The sample with
x?0.4 and
y=0, 0.05 and 0.10 showed peaking behavior near Curie temperature, which is attributed to the decrease of anisotropy constant
K1 to zero. Low-frequency dispersion of initial permeability suggests domain wall displacement. Addition of Cd
2+ resulted in a sharp decrease in Curie temperature. With the addition of Cr
3+, initial permeability was found to decrease.
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