Structure and Magnetic Properties of SrFe12O19/CoFe2O4 Nanocomposite Ferrite

Abstract

Abstract: Nanocomposite particles SrFe₁₂O₁₉/ CoFe₂O₄ were synthesized by sol-gel method. The nanocomposites are formed at the calcining temperature around 850 ^oC in 5 hours. The phase composition, surface morphology and magnetic properties of the nanocomposites were investigated using XRD, SEM and VSM, respectively. The results show that the magnetic properties of nanocomposite particles are strongly influenced by the molar ratios of the hard and soft phases and particle size distributions. The samples with the mass ratio of R_m= SrFe₁₂O₁₉/ NiFe₂O₄ = 1/3 and 1/5 are characterized with a “bee waist” type hysteresis loop. While all the samples R_V show an excellent smooth hysteresis loop and a single – phase magnetization behavior. The coercivity decreases significantly and the magnetization drastically increases with decreasing of volume ratio R_V.

Keywords: nanocomposite, sol- gel method, exchange coupling. 

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