Citation: Bo Hu, Yanyi Chen, Yongzheng Chen, Xuan Wang, Xijiang Han, Yunchen Du. Theoretical guidance for the rational design of FeCo foams toward efficient electromagnetic wave absorption in 2.0–8.0 GHz range[J]. Acta Physico-Chimica Sinica, ;2026, 42(6): 100269. doi: 10.1016/j.actphy.2026.100269 shu

Theoretical guidance for the rational design of FeCo foams toward efficient electromagnetic wave absorption in 2.0–8.0 GHz range

Bo Hu ¹ ,
Yanyi Chen ¹ ,
Yongzheng Chen ¹ ,
Xuan Wang ^{1, 2} ,
Xijiang Han ^1,, ,
Yunchen Du ^1,,

1.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China
2.
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, Shaanxi Province, China

Corresponding author: Xijiang Han, hanxijiang@hit.edu.cn Yunchen Du, yunchendu@hit.edu.cn
Received Date: 12 January 2026
Revised Date: 25 February 2026
Accepted Date: 27 February 2026

Effective electromagnetic (EM) wave absorption with minimal coating thickness in the low- to mid-frequency range (2.0–8.0 GHz) remains a significant challenge. Herein, the EM parameters required for low- to mid-frequency EM wave absorption are systematically investigated, and CST Microwave Studio is employed to model and simulate how these target parameters can be realized through microstructural design. The results demonstrate that increasing the real parts of the relative permittivity (ε_r′) and permeability (μ_r′) is beneficial for achieving low- to mid-frequency EM wave absorption with reduced coating thickness. Moreover, CST simulations reveal that, for the same material system and identical volume filling fraction, increasing the specific surface area of the absorber contributes to an enhancement of ε_r′. Guided by these principles, FeCo cubes, FeCo particles, and FeCo foams with controlled specific surface areas and high permeability were synthesized. Experimental results confirm that an increased specific surface area effectively enhances ε_r′, thereby promoting low- to mid-frequency absorption. As a result, the FeCo foam achieves an effective absorption bandwidth (EAB) of 3.2 GHz (4.8–8.0 GHz) in the C-band with a coating thickness of 2.0 mm, and 1.5 GHz (2.1–3.6 GHz) in the S-band with a coating thickness of 4.0 mm. This work provides valuable insights into the rational design of advanced low- to mid-frequency EM absorbing materials.
- Electromagnetic wave absorption,
- Microstructure design,
- FeCo foam,
- Wideband absorption,
- Specific surface area
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沈阳化工大学材料科学与工程学院沈阳 110142