Study of magnetic interaction between hard and soft magnetic ferrite in the nanocomposite.

The nanocomposite of ferrites [(60%) BaFe₁₂O₁₉ + (40%) CoFe_1.75 Zn_0.25O₄] has been prepared by the high energy ball milling method. The individual sample BHF (BaFe₁₂O₁₉) and CZF (CoFe_1.75 Zn_0.25 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 1000°C. The magnetic hysteresis (M-H) 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 an interaction between soft and hard magnetic phases. The M-H loops were recorded at different temperatures of sample prepared by the ball milling. Magnetic interaction between soft and hard magnetic phases at low temperature (60K) is different compare to that of room temperature. The maximum magnetic saturation (M_s) and coercivity (H_c) are found to be 77 emu/g and 3.8 kOe at 60K respectively. [ABSTRACT FROM AUTHOR]