Surface magnetic interactions between Bi0.85La0.15FeO3 and BaFe12O19 nanomaterials in (1-x)Bi0.85La0.15FeO3-(x)BaFe12O19 nanocomposites.

• Increase in M r , M S and H c with increase in BHF percentage BLFO-BHF composite. • ΔH ~ M plot explains the magnetic interaction between BLFO and BHF magnetic phase. • Vegard's law has been used to calculate the theoretical magnetization. • Law of approach to saturation has been employed to analyze the magnetic hysteresis. Two different sets of multiferroic nanocomposites i.e., (1-x)Bi 0.85 La 0.15 FeO 3 -(x)BaFe 12 O 19 with x = 0.00, 0.05, 0.10, 0.20, 0.30, 0.40, 0.50 and 1.00 have been synthesized by the solid-state reaction method and high energy planetary ball mill techniques. The peaks in the XRD patterns can be indexed to R3c crystal symmetry of Bi 0.85 La 0.15 FeO 3 and P63/mmc crystal symmetry of BaFe 12 O 19. It suggests the absence of any major chemical reaction between the two phases. Moreover, it is assumed thatBi 0.85 La 0.15 FeO 3 and BaFe 12 O 19 crystal symmetries are present in the composite independently. Magnetic properties have been improved significantly due to the incorporation of BaFe 12 O 19 in the composites. Vegard's law suggests that the experimentally observed magnetizations are higher than that of theoretically calculated value. The difference between the theoretical and experimental magnetization as well as the anomaly in the magnetic hysteresis have been explained by considering the magnetic interaction correlation length between Bi 0.85 La 0.15 FeO 3 and BaFe 12 O 19 magnetic phases. The hysteresis loop width (ΔH) versus M plots has been introduced to understand the magnetic interaction (exchange bias) between Bi 0.85 La 0.15 FeO 3 and BaFe 12 O 19. Magnetocrystalline anisotropy increases with the increase in the percentage of BaFe 12 O 19 in the composite. [ABSTRACT FROM AUTHOR]