[Advanced Functional Materials] Multi-mechanism Decoupling for Low-frequency Microwave Absorption Hierarchical Fe-doped Co Magnetic Microchains
作者：Yixuan Han, Hua Guo, Hua Qiu, Jinwen Hu, Mukun He, Xuetao Shi, Yali Zhang, Jie Kong, Junwei Gu
關(guān)鍵字：Density functional theory simulation, Electromagnetic simulation, Hydrothermal synthesis, Low-frequency absorption, Magnetic field induced orientation
論文來源：期刊
發(fā)表時(shí)間：2025年
Yixuan Han, Hua Guo, Hua Qiu, Jinwen Hu, Mukun He, Xuetao Shi, Yali Zhang*, Jie Kong, Junwei Gu*. Multi-mechanism Decoupling for Low-frequency Microwave Absorption Hierarchical Fe-doped Co Magnetic Microchains, Advanced Functional Materials, 2025, 10.1002/adfm.202506803. 2024IF=19.0. （1區(qū)材料科學(xué)Top期刊）
https://doi.org/10.1002/adfm.202506803
Abstract
The rapid development of military and civilian electronic communication technology poses a severe challenge to controlling electromagnetic radiation pollution in the low-frequency microwave band. This study introduces a novel one-step feeding self-assembly and ripening strategy to synthesize 1D@2D magnetic microchains (Co@FexCo1-xOOH, CFC). The experimental and simulation results show that increasing the flux length and ordered orientation is very important to improve the absorption performance of one-dimensional magnetic absorber. The CFC-LC-E (long-chain CFC aligned along the electric field direction) prepared based on the above characteristics successfully achieves a high-performance microwave absorption effect, with a minimum reflection loss value (RLmin) of -66.4 dB. Notably, it maintains stable performance against oblique incidence (within 90o) and polarizations (transverse electric and transverse magnetic). This work offers novel ideas in the fabrication of 1D magnetic microwave absorbers and the analysis of microwave absorption mechanisms.
軍民用電子通訊技術(shù)的快速發(fā)展對控制低頻微波頻段電磁輻射污染問題提出了嚴(yán)峻的挑戰(zhàn)。材料微觀（核殼結(jié)構(gòu)）-宏觀（定向結(jié)構(gòu)）的可控設(shè)計(jì)和調(diào)控能有效解決不同場景下的電磁輻射污染問題。本文提出一步投料自組裝-熟化的全新策略，通過磁場誘導(dǎo)將0D顆粒自組裝成1D磁性微鏈，再通過奧氏熟化合成1D@2D磁性微鏈（Co@FexCo1-xOOH magnetic chain, CFC），形成豐富的晶體/晶體異質(zhì)界面和磁電耦合網(wǎng)絡(luò)。電磁仿真和微磁模擬結(jié)果表明，增大CFC的鏈長可以提升CFC的介電常數(shù)實(shí)部（5.2到29.6）和磁導(dǎo)率實(shí)部（1.2到1.3），將CFC沿電場方向排列可以提升CFC的介電常數(shù)實(shí)部（1.2到29.6），沿磁場方向排列可以提升CFC的磁導(dǎo)率實(shí)部（1.0到1.3），其實(shí)驗(yàn)與模擬結(jié)果相符，填補(bǔ)了一維填料分布狀態(tài)調(diào)控復(fù)合材料電磁參數(shù)方面的理論與實(shí)驗(yàn)空白，擺脫了對利用半經(jīng)驗(yàn)規(guī)則認(rèn)知材料電磁損耗模式的依賴。基于上述特性制備的沿電場取向長鏈CFC（CFC-LC-E）成功實(shí)現(xiàn)了卓越的吸波效果，其最小反射損耗值（RLmin）達(dá)-66.4 dB。此外，該材料5G頻段的吸波特性對不同極化模式和入射角度的電磁波均有效，對垂直極化和水平極化的寬入射角度（-90o到90o）電磁波均有極小的雷達(dá)散射截面積（RCS）（＜-15.0 dB·m2）。本工作不僅為低維磁性吸波劑的可控制備及其吸波機(jī)制解析方面提供了全新的思路，也有望對未來電子設(shè)備吸波組件的研發(fā)提供新的設(shè)計(jì)依據(jù)和基礎(chǔ)理論指導(dǎo)。