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Communication

Hierarchical design of FeCo-based microchains for enhanced microwave absorption in C band

Yixuan Han1, Mukun He1, Jinwen Hu2, Panbo Liu1, Zhongwu Liu2, Zhonglei Ma1, Wenbo Ju2(), Junwei Gu1()
Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
School of Physics and Optoelectronics, and School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
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Hierarchical core–shell structure and magnetic nanochains can improve magnetic coupling and ferromagnetic resonance in absorption performance. In addition, it reached an optimal RLmin of −48.8 dB at 9.4 GHz and fE of 6.6 GHz at 2.0 mm.

Abstract

Microwave absorbing materials (MAMs) has been intensively investigated in order to meet the requirement of electromagnetic radiation control, especially in S and C band. In this work, FeCo-based magnetic MAMs are hydrothermally synthesized via a magnetic-field-induced process. The composition and morphology of the MAMs are capable of being adjusted simultaneously by the atomic ratio of Fe2+ to Co2+ in the precursor. The hierarchical magnetic microchain, which has a core–shell structure of two-dimensional FexCo1−xOOH nanosheets anchored vertically on the surface of a one-dimensional (1D) Co microchain, shows significantly enhanced microwave absorption in C band, resulting in a reflection loss (RL) of lower than −20 dB at frequencies ranging from 4.4 to 8.0 GHz under a suitable matching thickness. The magnetic coupling of Co microcrystals and the double-loss mechanisms out of the core-shell structure are considered to promote the microwave attenuation capability. The hierarchical design of 1D magnetic MAMs provides a feasible strategy to solve the electromagnetic pollution in C band.

Keywords

one-dimensional micromagnetshierarchical structuremicrowave absorbing materialmagnetic couplingdouble-loss mechanisms

Electronic Supplementary Material

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Nano Research
Volume 16 Issue 1,
January 2023
Pages 1773-1778
DOI: 10.1007/s12274-022-5111-y
Cite this article:
Han Y, He M, Hu J, et al. Hierarchical design of FeCo-based microchains for enhanced microwave absorption in C band. Nano Research, 2023, 16(1): 1773-1778. https://doi.org/10.1007/s12274-022-5111-y
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