Synthesis and characterization of RADAR absorbing BaFe₁₂O₁₉/NiFe₂O₄ magnetic nanocomposite

Magnetic composite comprising nickel ferrite and barium hexaferrite; BaFe12O19/NiFe2O4 nanoparticles having super paramagnetic nature were synthesized by co-precipitation method. The resulting precursors were heat treated (HT) at 800, 1000 and 1200°C for 4 h in nitrogen atmosphere. The ‘as synthesized’ particles have size in the range of 20–22 nm with spherical shape. Further, this spherical shaped nanoparticle changes their morphology to hexagonal plate shape with increase in HT temperatures. The effect of such a systematic morphological transformation of nanoparticles on magnetic and microwave absorption properties were estimated in X band.