Synthesis and magnetic properties of hard-soft SrFe10Al 2O19/NiZnFe2O4 ferrite nanocomposites


Pure phase exchange-coupled nanocomposites of hard-soft magnetic oxides, (hard) SrFe10Al2O19- (soft) Ni 0.75Zn0.25Fe2O4 were prepared via autocombution method. Magnetic properties of the nanocomposites were assessed as a function of soft-phase content in the nanocomposite. A 40% increase in M s value was observed for nanocomposite with 30 Wt.% of the soft phase. A linear increase in Mr. /Ms with soft-phase content indicates the presence of enhanced exchange-coupling between hard and soft phases of the nanocomposite. The highest MR /Ms ratio of 0.68 was obtained for nanocomposite containing 30 Wt.% of the soft-phase. The observed reduction in coercieve field values of the nanocomposite with increase in soft-phase content is explained on the basis of competition between exchange and dipolar interaction between hard-soft and soft-soft phases of the nanocomposite. Copyright © 2014 American Scientific Publishers All rights reserved.

Publication Title

Journal of Nanoscience and Nanotechnology