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The nanocomposite of ferrites [(60%) BaFe12O19+(40%) CoFe1. 75 Zn0. 25O4] has been prepared by the high energy ball milling method. The individual sample BHF (BaFe12O19) and CZF (CoFe1. 75 Zn0. 25 O4) are synthesized by the modified sol-gel method. The X-ray diffraction technique was employed to study the crystal structure of the sample. The maximum crystallite size of BHF and CZF are found to be 40±2 nm and 36±2 nm respectively in the composite which was annealed at 1000oC. The magnetic hysteresis (MH) loop of nanocomposite has been recorded by the VSM (vibrational sample magnetometer) technique. The magnetic interaction between soft and hard magnetic phases is studied by plotting the graph between loop width (ΔH) verses magnetization (M). The loop width versus magnetization changes with the annealing temperature due to increase in the particle size. It is observed that there is …