Optimizing magnetic/dielectric matching in permalloy/carbonized cotton fiber composites by strain-tunable ferromagnetic resonance and defect-induced dielectric polarization  

作　　者：Xiaochen Shen Chenglong Hu Wenling Ren Rongzhi Zhao Lianze Ji Xuefeng Zhang Xinglong Dong 

机构地区：[1]Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116023,China [2]Key Laboratory for Anisotropy and Texture of Materials(MOE),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [3]Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China

出　　处：《Journal of Materials Science & Technology》2022年第29期174-181,共8页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(NSFC,Nos.51901062,U1908220);the Natural Science Foundation of Zhejiang Province(No.LR18E010001);the Key R&D Project of Zhejiang Province(Nos.2019C01121,2021C01023);the LiaoNing Revitalization Talents Program(No.XLYC1807177)。

摘　　要：Electromagnetic losses in composites could be synergistically controlled by permeability and permittivity,associated with multiple ferromagnetic resonances and dielectric polarization.However,it is still challenging for simultaneous tunability for both the terms in a magnetic/dielectric composite system.Here,we demonstrate the tunable ferromagnetic resonances and the enhanced dielectric losses at gigahertz frequencies in permalloy/carbonized cotton fiber composites with different annealing temperatures.It is theoretically confirmed that the stress field acting on the magnetic permalloy layer increases with increasing temperature because of the shrinkage of the dielectric carbonized cotton fibers,resulting in multiple ferromagnetic resonances,in which there is a linear relationship(f=1.52×σ+9.38)between the resonance frequency(f)and the stress(σ).The present work provides a fundamental insight into understanding the micromagnetic dynamics of the magnetic/dielectric composite system.

关 键 词：Ferromagnetic resonance Stress tuning Dielectric polarization 

分 类 号：TB333[一般工业技术—材料科学与工程]