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.
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