Wang Zhen, An Chao, Wang Fenglong, Liang Hongsheng, Hou Zhaoyang, Shen Hao, Wu Hongjing
Department of Applied Physics, School of Science, Chang'an University, Xi'an 710064, China.
School of Intelligent Manufacturing Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China.
Nanomaterials (Basel). 2025 Jul 14;15(14):1091. doi: 10.3390/nano15141091.
Metallic magnetic materials are extensively used to mitigate electromagnetic interference due to their high Curie temperatures and permeability. However, their high permittivity often hinders impedance-matching effectiveness, limiting their utility. In this study, amorphous cobalt-iron (CoFe) alloy nanoparticles with relatively low permittivity were synthesized using a simple aqueous reduction method at room temperature. The effect of atomic ratio variation on the microwave absorption properties of these nanoparticles was investigated across 2-18 GHz. The amorphous CoFe nanoparticles exhibited excellent electromagnetic wave absorption performance, achieving an effective absorption bandwidth of 5.6 GHz, a matching thickness of 2.60 mm, and a reflection loss of -42 dB.
金属磁性材料因其高居里温度和磁导率而被广泛用于减轻电磁干扰。然而，它们的高介电常数常常阻碍阻抗匹配效果，限制了其应用。在本研究中，采用简单的室温水相还原法合成了具有相对较低介电常数的非晶钴铁（CoFe）合金纳米颗粒。研究了原子比变化对这些纳米颗粒在2-18 GHz范围内微波吸收性能的影响。非晶CoFe纳米颗粒表现出优异的电磁波吸收性能，有效吸收带宽达到5.6 GHz，匹配厚度为2.60 mm，反射损耗为-42 dB。
