Microwave dielectric and magnetic properties of superparamagnetic 8-nm Fe₃O₄ nanoparticles

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• 作者：Fusheng Wen ; ^{wenfsh03@126.com} ; Fang Zhang ; Hong Zheng
• 关键词：Nanostructure ; Cole&ndash ; Cole permittivity dispersion law ; Natural resonance ; Microwave absorption
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：August, 2012
• 卷：324
• 期：16
• 页码：2471-2475
• 文件大小：637 K

摘要

The superparamagnetic 8-nm Fe₃O₄ nanoparticles were successfully prepared by chemical oxidation process. For the complex permittivity, the dual dielectric relaxation processes have been proved by two overlapped Cole-Cole semicircles, and the natural resonance frequency is 3.03 GHz for the complex permeability. The maximum reflection loss value reaches 鈭?5.5 dB at 6.11 GHz with 3.85 mm in the thickness of the absorbers for the superparamagnetic 8-nm Fe₃O₄ nanoparticles which is better than that of 150 nm and 30 nm Fe₃O₄ nanoparticles. It is believed that the superparamagnetic 8-nm Fe₃O₄ nanoparticles can be used as a kind of candidate for microwave absorber.