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首页> 外文期刊>RSC Advances >Nanocrystalline Ni0.8Zn0.2Fe2O4/SrFe12O19 composite fibers with enhanced exchange coupling behavior
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Nanocrystalline Ni0.8Zn0.2Fe2O4/SrFe12O19 composite fibers with enhanced exchange coupling behavior

机译：具有增强的交换耦合性能的纳米晶Ni0.8Zn0.2Fe2O4 / SrFe12O19复合纤维

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摘要

Exchange coupled nanocrystalline Ni0.8Zn0.2Fe2O4 (NZFO)/SrFe12O19 (SFO) composite fibers were successfully fabricated using the sol-gel spinning technique followed by annealing. Pure phase nanocrystalline composite fibers, consisting of magnetically soft NZFO and hard SFO phases, were obtained at 900 degrees C for 2 h in air. The results showed that the magnetic properties of the NZFO/SFO composite fibers strongly depended on annealing temperature. At the annealing temperature of 900 degrees C, the hysteresis loop of the NZFO/SFO composite fiber showed a single-phase-like magnetic characteristic, indicating the existence of effective exchange coupling between the NZFO phase and the SFO phase. The saturation magnetization (M-s), coercive force (H-c) and remanence (M-r) increased initially, reaching their maximum values at 1000 degrees C. However, as further increasing the annealing temperature to 1100 degrees C, a constrictive hysteresis loop appeared which implied the reduction of exchange coupling interactions and therefore decreased the magnetic properties of NZFO/SFO composite fibers.
机译：利用溶胶-凝胶纺丝技术并随后进行退火，成功地制备了交换耦合的纳米晶体Ni0.8Zn0.2Fe2O4（NZFO）/ SrFe12O19（SFO）复合纤维。在空气中于900摄氏度下2小时获得了由磁性软NZFO和硬SFO相组成的纯相纳米晶复合纤维。结果表明，NZFO / SFO复合纤维的磁性能强烈依赖于退火温度。在900摄氏度的退火温度下，NZFO / SFO复合纤维的磁滞回线显示出单相状的磁特性，表明NZFO相和SFO相之间存在有效的交换耦合。饱和磁化强度（Ms），矫顽力（Hc）和剩磁（Mr）最初增加，在1000摄氏度时达到最大值。但是，随着退火温度进一步提高到1100摄氏度，出现了收缩磁滞回线，这暗示着减少了交换耦合相互作用，因此降低了NZFO / SFO复合纤维的磁性能。

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