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

Xiaochen Shen ¹Chenglong Hu ²Wenling Ren ³Rongzhi Zhao ²Lianze Ji ²Xuefeng Zhang ²Xinglong Dong⁴

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作者信息

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;Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China
2. Key Laboratory for Anisotropy and Texture of Materials(MOE),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China
3. Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China
4. Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116023,China
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Abstract

Electromagnetic losses in composites could be synergistically controlled by permeability and permittivity,associated with multiple ferromagnetic resonances and dielectric polarization.However,it is still chal-lenging 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(fr=1.52 x σ+9.38)be-tween the resonance frequency(fr)and the stress(σ).The present work provides a fundamental insight into understanding the micromagnetic dynamics of the magnetic/dielectric composite system.

Key words

Ferromagnetic resonance/Stress tuning/Dielectric polarization

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基金项目

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量75

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