Rai B K, Wang L, Mishra S R, Nguyen V V, Liu J P
J Nanosci Nanotechnol. 2014 Jul;14(7):5272-7. doi: 10.1166/jnn.2014.8836.
Pure phase exchange-coupled nanocomposites of hard-soft magnetic oxides, (hard) SrFe10Al2O19(-) (soft) Ni0.75Zn0.25Fe2O4 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 M(r)/M(s) with soft-phase content indicates the presence of enhanced exchange-coupling between hard and soft phases of the nanocomposite. The highest M(r)/M(s) 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.
通过自燃烧法制备了硬磁 - 软磁氧化物的纯相交换耦合纳米复合材料，即（硬磁相）SrFe10Al2O19 - （软磁相）Ni0.75Zn0.25Fe2O4。评估了纳米复合材料的磁性能与纳米复合材料中软相含量的关系。对于含有30 wt.%软相的纳米复合材料，观察到M(s)值增加了40%。M(r)/M(s)随软相含量呈线性增加，表明纳米复合材料的硬相和软相之间存在增强的交换耦合。对于含有30 wt.%软相的纳米复合材料，获得了最高的M(r)/M(s)比值0.68。基于纳米复合材料硬 - 软相和软 - 软相之间的交换和偶极相互作用的竞争，解释了随着软相含量增加纳米复合材料矫顽场值的降低。
