Citation: Shihao Tan, Caiyun Cui, Shuwei Ma, Liangsen Zhu, Xianguo Liu. Introducing nanocrystalline/amorphous heterostructures on laminated FeSiBCr to synchronously enhance absorption, expand absorption bandwidth and reduce matching thickness[J]. Acta Physico-Chimica Sinica, ;2026, 42(7): 100283. doi: 10.1016/j.actphy.2026.100283 shu

Introducing nanocrystalline/amorphous heterostructures on laminated FeSiBCr to synchronously enhance absorption, expand absorption bandwidth and reduce matching thickness

1.
Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, Zhejiang Province, China;
2.
School of New Energy, Wanjiang University of Technology, Ma'anshan 243031, Anhui Province, China

Corresponding author: Xianguo Liu, liuxg@hdu.edu.cn
Received Date: 11 February 2026
Revised Date: 8 March 2026
Accepted Date: 9 March 2026

Synchronously enhancing absorption ability, expanding absorption bandwidth, and reducing matching thickness still pose significant challenges for a single material. In this work, laminated powders were prepared by vertically milling amorphous FeSiBCr powder. Due to the high energy during milling process, ~15 nm α-Fe phase and ~3 nm surface oxidation layer appeared in laminated FeSiBCr, which created multiple dielectric relaxation, magnetic-dielectric interface and planar anisotropy. Multiple dielectric relaxation originating from crystalline/amorphous heterostructures and oxide layer contributed to low permittivity and enhanced dielectric loss capacity, planar anisotropy induced by flaky morphology and α-Fe phase improved permeability and magnetic loss ability. Low permittivity and high permeability facilitated impedance matching. Enhanced loss capability and good impedance matching resulted in good absorption performances. Compared with that (RL_m of -8.99 dB at 2.6 mm and EAB of 0 GHz) of FeSiBCr flakes, the laminated FeSiBCr exhibited an effective absorption bandwidth (EAB) of 6.56 GHz at 1.8 mm thickness and the minimal reflection loss (RL_m) of -34.22 dB at 2.0 mm. Moreover, the periodic gradient structure excited resonance at different frequencies to form multiple resonance superposition, thus expanding EAB to 13.18 GHz with an increase of up to 200.9%. This work offers a new approach for the rational design of laminated amorphous materials with crystalline/amorphous heterostructures for efficient microwave absorbers.
- Microwave absorption performances,
- FeSiBCr,
- Core-shell structure,
- Magnetic-dielectric interface,
- Effective absorption bandwidth
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