Size Influence to the High-Frequency Properties of Granular Magnetite Nanoparticles
Size Influence to the High-Frequency Properties of Granular Magnetite Nanoparticles
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DOI：
10.1109/tmag.2014.2331061
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发表时间：
2014-12
影响因子：
2.1
通讯作者：
Jue Liu;M. Zeng;R. Yu;Xiaofang Liu;Minggang Zhu
中科院分区：
文献类型：
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作者：
Jue Liu;M. Zeng;R. Yu;Xiaofang Liu;Minggang Zhu
我们使用溶剂热方法制备颗粒状Fe 3 O 4纳米粒子，其粒径范围为20 - 250 nm。制造过程中的磁力搅拌可以进一步减小颗粒的尺寸。为了研究复合材料的高频动态磁性能，在1-15 GHz频率范围内测量了复合材料的复磁导率和复介电常数，并通过进一步计算得到了反射损耗。结果表明，颗粒尺寸对材料的渗透性和吸波性能有很大影响。本征渗透率可以从扩展的Bruggeman有效介质理论导出。结果表明，在磁场搅拌下制备的粒径为20 nm的Fe 3 O 4纳米粒子具有较好的吸波性能。
We fabricate granular Fe3O4 nanoparticles with tunable particles sizes ranging from 20 to 250 nm using the solvothermal method. Magnetic stirring during the fabrication can further reduce the size of the particle. To investigate the high-frequency dynamic magnetic properties, the complex permeability and complex permittivity of the composites are measured in a frequency range of 1-15 GHz, and the reflection loss can be obtained through further calculation. The results show that the granular size strongly influences the permeability and the absorbing property of the material. The intrinsic permeability can be derived from the extended Bruggeman effective medium theory. The Fe3O4 nanoparticles assisted by magnetic stirring with a size of 20 nm shows high performance in absorption compared with other bigger counterparts prepared without magnetic stirring.