Modulating Electromagnetic Genes Through Bi‑Phase High‑Entropy Engineering Toward Temperature‑Stable Ultra‑Broadband Megahertz Electromagnetic Wave Absorption  

作　　者：Xiaoji Liu Yuping Duan Nan Wu Guangming Li Yuan Guo Jiangyong Liu Ning Zhu Qiang Wang Lin Wang Zichen Xu Hao Wei Guojun Wang Zhijia Zhang Songsong Zhang Wenjun Zhou Teng Ma Tongmin Wang 

机构地区：[1]Qingdao Innovation and Development Base of Harbin Engineering University,Harbin Engineering University,Qingdao 266000,People’s Republic of China [2]Key Laboratory of Solidification Control and Digital Preparation Technology,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,People’s Republic of China [3]National Key Laboratory of Electromagnetic Effect and Security On Marine Equipment,China Ship Development and Design Center,Wuhan 430205,People’s Republic of China [4]Wuhan Second Ship Design and Research Institute,Wuhan 430205,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第7期254-269,共16页纳微快报(英文版)

基　　金：Supported by Program for the National Natural Science Foundation of China(No.52071053,U1704253,52103334);the Fundamental Research Funds for the Central Universities(DUT24GF102);the Shandong Province Natural Science Youth Fund(ZR2024QA134)。

摘　　要：Magnetic absorbers with high permeability have significant advantages in lowfrequency and broadband electromagnetic wave(EMW)absorption.However,the insufficient magnetic loss and inherent high conductivity of existing magnetic absorbers limit the further expansion of EMW absorption bandwidth.Herein,the spinel(FeCoNiCrCu)_(3)O_(4) high-entropy oxides(HEO)are successfully constructed on the surface of FeCoNiCr_(0.4)Cu_(0.2) high-entropy alloys(HEA)through low-temperature oxygen bath treatment.On the one hand,HEO and HEA have different magnetocrystalline anisotropies,which is conducive to achieving continuous natural resonance to improve magnetic loss.On the other hand,HEO with low conductivity can serve as an impedance matching layer,achieving magneto-electric co-modulation.When the thickness is 5 mm,the minimum reflection loss(RL)value and absorption bandwidth(RL<−5 dB)of bi-phase high-entropy composites(BPHEC)can reach−12.8 dB and 633 MHz,respectively.The RCS reduction value of multilayer sample with impedance gradient characteristic can reach 18.34 dB m^(2).In addition,the BPHEC also exhibits temperaturestable EMW absorption performance,high Curie temperature,and oxidation resistance.The absorption bandwidth maintains between 593 and 691 MHz from−50 to 150℃.This work offers a new and tunable strategy toward modulating the electromagnetic genes for temperature-stable ultra-broadband megahertz EMW absorption.

关 键 词：Bi-phase high-entropy composites Electromagnetic genes Electromagnetic wave absorption Continuous natural resonance ULTRA-BROADBAND 

分 类 号：TB34[一般工业技术—材料科学与工程]