Zhao Rongzhi, Gao Tong, Li Yixing, Sun Zhuo, Zhang Zhengyu, Ji Lianze, Hu Chenglong, Liu Xiaolian, Zhang Zhenhua, Zhang Xuefeng, Qin Gaowu
Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310012, China.
Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China.
Nat Commun. 2024 Feb 19;15(1):1497. doi: 10.1038/s41467-024-45815-w.
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) FeC 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 FeC 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 (RL) is -52.09 dB (15.85 GHz, 2.90 mm) with an effective absorption bandwidth (EAB) 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.
具有片状几何形状的软磁材料可为突破斯耐克极限提供形状各向异性，这对于实现高频铁磁共振和微波吸收性能很有前景。在此，通过电化学脱合金辅助的固态相变获得了具有晶体取向的二维（2D）FeC微片。通过在不同等温淬火温度下控制2D FeC微片的厚度，可进一步调节形状各向异性。因此，在从700℃等温淬火至550℃的过程中，共振频率有效地从9.47GHz和11.56GHz进行了调整。复磁导率的虚部在11.56GHz时可达到0.9，最小反射损耗（RL）为-52.09dB（15.85GHz，2.90mm），有效吸收带宽（EAB）为2.55GHz。本研究为制备用于获得高性能微波吸收体的高频磁损耗材料提供了见解，并实现了从传统结构材料制备功能材料。
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