Magnetic vortex core-shell Fe3O4@C nanorings with enhanced microwave absorption performance

By X. Wang, Fei Pan, Zhen Xiang, Qingwen Zeng, Ke Pei, R. Che, W. Lu. 2020

378 citations recorded by the source corpus.

Abstract Fabricating microwave absorbers (MA) with strong attenuation capability and lightweight is still a challenge problem, which limit their further applications in our daily life. Herein, magnetic vortex core-shell Fe3O4@C nanorings (FNR-C) with excellent microwave absorption property have been successfully prepared by a facile strategy. Electron holography analysis is carried out to detect the magnetic vortex structure of FNR-C. Furthermore, the microwave absorption properties of these samples are investigated in terms of complex permittivity and permeability. The FNR-C exhibits a strong reflection loss value of −61.54 dB at 16.9 GHz with a thickness of 1.50 mm and a low filling ratio of 25%. It’s the first time to take magnetic vortex into discussion. The unexceptionable attenuation ability is mainly attributed to the eddy current loss enhanced by combination of confinement vortex and strain-driven vortex. Besides, thanks to the dielectric feature of carbon, the Fe3O4 core is beneficial for the impedance match. Our findings provide a guidance to the development of nanoferrite@carbon hybrid materials with excellent microwave absorption property from the perspective of magnetic vortex.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/7111aa47a41c6aa7af5c479c04fbc361ac066eb6