Highly anisotropic Fe3C microflakes constructed by solid-state phase transformation for efficient microwave absorption

Rongzhi Zhao, Tong Gao, Yixing Li (), Zhuo Sun, Zhengyu Zhang, Lianze Ji, Chenglong Hu, Xiaolian Liu, Zhenhua Zhang, Xuefeng Zhang () and Gaowu Qin
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Rongzhi Zhao: Hangzhou Dianzi University
Tong Gao: Hangzhou Dianzi University
Yixing Li: Hangzhou Dianzi University
Zhuo Sun: Northeastern University
Zhengyu Zhang: Northeastern University
Lianze Ji: Hangzhou Dianzi University
Chenglong Hu: Hangzhou Dianzi University
Xiaolian Liu: Hangzhou Dianzi University
Zhenhua Zhang: Hangzhou Dianzi University
Xuefeng Zhang: Hangzhou Dianzi University
Gaowu Qin: Northeastern University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Soft magnetic materials with flake geometry can provide shape anisotropy for breaking the Snoek limit, which is promising for achieving high-frequency ferromagnetic resonances and microwave absorption properties. Here, two-dimensional (2D) Fe3C microflakes with crystal orientation are obtained by solid-state phase transformation assisted by electrochemical dealloying. The shape anisotropy can be further regulated by manipulating the thickness of 2D Fe3C microflakes under different isothermally quenching temperatures. Thus, the resonant frequency is adjusted effectively from 9.47 and 11.56 GHz under isothermal quenching from 700 °C to 550 °C. The imaginary part of the complex permeability can reach 0.9 at 11.56 GHz, and the minimum reflection loss (RLmin) is −52.09 dB (15.85 GHz, 2.90 mm) with an effective absorption bandwidth (EAB≤−10 dB) of 2.55 GHz. This study provides insight into the preparation of high-frequency magnetic loss materials for obtaining high-performance microwave absorbers and achieves the preparation of functional materials from traditional structural materials.

Date: 2024
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DOI: 10.1038/s41467-024-45815-w

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