EFFECT OF ANTIMONY DOPING ON MAGNETIC-PROPERTIES OF NI-ZN FERRITES

The influence of Sb5+ doping on magnetic initial permeability (mu') and magnetic loss factor (mu") in Ni-Zn ferrites over a frequency range from 10 kHz to 1 G Hz at room temperature is studied. The Curie temperature (T(c)), saturation magnetization (M(s)), lattice constant (a) and mean grain diameter (D(m)) of the pure and doped ferrites have also been evaluated. Domain wall relaxation has been observed in all the samples. Using the existing theories the magneto-crystalline anisotropy constant (K) and certain domain wall constants like wall damping parameters (beta), domain wall energy (sigma(w)), the wall mobility (mu(infinity)) and the wall mass (m(w)) have been evaluated and the results are compared and discussed with the similar data available on other ferrimagnetic oxides.