分散于石蜡中的Fe_3O_4磁性纳米颗粒的相互作用  

Interactions Between Fe_3O_4 Nanoparticles Dispersed in Paraffin

作　　者：郑虹[1] 周栋[1] 温福昇[1] 高原[1] 李发伸[1] 

机构地区：[1]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

出　　处：《磁性材料及器件》2008年第4期15-17,21,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(90505007)

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ΔI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。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 nanoparti^les 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.

关 键 词：FE3O4 纳米颗粒 磁性 相互作用 

分 类 号：O482.5[理学—固体物理]