| 分散于石蜡中的Fe3O4磁性纳米颗粒的相互作用 |
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| 引用本文： | 郑虹,周栋,温福昇,高原,李发伸.分散于石蜡中的Fe3O4磁性纳米颗粒的相互作用[J].磁性材料及器件,2008,39(4). |
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| 作者姓名： | 郑虹 周栋 温福昇 高原 李发伸 |
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| 作者单位： | 兰州大学,磁学与磁性材料教育部重点实验室,应用磁学研究所,甘肃兰州,730000 |
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| 摘 要： | 采用NaNO2氧化法制备出分散性良好的Fe3O4磁性纳米颗粒,通过△I曲线方法研究了均匀分散于石蜡中的Fe3O4 纳米颗粒间的相互作用随分散浓度的变化,以及相互作用对样品矫顽力的影响.结果表明,纳米Fe3O4颗粒之间的相互作用主要表现为退磁相互作用, 且随着分散浓度的增大相互作用最大值和复合材料矫顽力均减小,这是由于偶极相互作用和交换相互作用共同作用的结果.
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| 关 键 词： | 纳米颗粒 磁性 相互作用 |
Interactions Between Fe3O4 Nanoparticles Dispersed in Paraffin |
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| ZHENG Hong,ZHOU Dong,WEN Fu-sheng,GAO Yuan,LI Fa-shen.Interactions Between Fe3O4 Nanoparticles Dispersed in Paraffin[J].Journal of Magnetic Materials and Devices,2008,39(4). |
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| Authors: | ZHENG Hong ZHOU Dong WEN Fu-sheng GAO Yuan LI Fa-shen |
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| Abstract: | Well-dispersed Fe3O4 nanoparticles were successfully synthesiszed by oxidizing Fe(OH)2 with NaNO2. The interaction effect in Fe3O4 nanoparticles dispersed in paraffin with different quality concentrations and its influence on the coercivity were examined. The results indicated that the main interaction between the Fe3O4 nanoparticles is dipolar interaction. It is found that with the increase of concentration of Fe3O4 nanoparticles both the max value of interaction and the coercivity decrease, which can be attributed to the combined result of dipolar interaction and exchange-couple interaction. |
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| Keywords: | Fe3O4 |
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