Microwave-absorption properties of FeCo microspheres self-assembled by Al2O3-coated FeCo nanocapsules

作者：X. G. Liu, Dawei Geng, zeyu zhang · 发表于：Applied Physics Letters · 年份：2008 · DOI：10.1063/1.2945639 · 被引用次数：198 · 研究领域：Electromagnetic wave absorption materials、Advanced Antenna and Metasurface Technologies、Metamaterials and Metasurfaces Applications

FeCo microspheres, self-assembled by Al2O3-coated FeCo nanocapsules, were prepared by means of the arc-discharge technique to investigate application in electromagnetic-wave absorption. For the FeCo microspheres, a reflection loss (RL) exceeding −20dB was obtained in the frequency range of 10.9–15.6GHz for an absorber thickness of 1.2–2.0mm. An optimal RL of −30.8dB was found at 11.4GHz for an absorber thickness of 2.0mm. The excellent microwave-absorption properties are a consequence of a proper electromagnetic match in the microstructure of a strong natural resonance and of the shape anisotropy.