Exchange-coupling Interaction and Magnetic Properties of BaFe 12 O 19 /Ni 0.5 Zn 0.5 Fe 2 O 4 Nanocomposite Ferrite

Abstract

Nano-sized Ba-ferrite, Ni-Zn ferrite and BaFe12O19/Ni0.5Zn0.5Fe2O4 nanocomposite ferrite were prepared by sol-gel combustion method. Nanocomposite was calcined at temperature range of 600 similar to 900 degrees C for 1 h. According to the diffraction patterns, hard/soft nanocomposite was indicated to the coexistence of the magnetoplumbite structural BaFe12O19 and spinel Ni0.5Zn0.5Fe2O4 and agree with the standard data (JCPDS 10-0325). The particle size of nanocomposite turn out to be less than 90 nm. The nanocomposite ferrite shows a single-phase magnetization behavior, implying that the hard magnetic phase and soft magnetic phase were well exchangecoupled. The specific saturation magnetization (M-s) of the nanocomposite is located between hard (BaFe12O19) and soft ferrite (Ni0.5Zn0.5Fe2O4). The remanence (M-r) of nanocomposite ferrite is much higher than that for the individual BaFe12O19 and Ni0.5Zn0.5Fe2O4 ferrite. (BH) (max) is increased, generally.