J. Mater. Sci. Technol. ›› 2022, Vol. 124: 174-181.DOI: 10.1016/j.jmst.2022.01.027

• Research Article • Previous Articles     Next Articles

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

Xiaochen Shena,c,1, Chenglong Hub,c,1,*(), Wenling Renc, Rongzhi Zhaob,c, Lianze Jib,c, Xuefeng Zhangb,c,*(), Xinglong Donga   

  1. aKey Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China
    bKey Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
    cInstitute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, China
  • Received:2021-10-19 Revised:2021-12-01 Accepted:2022-01-10 Published:2022-10-10 Online:2022-04-06
  • Contact: Chenglong Hu,Xuefeng Zhang
  • About author:zhang@hdu.edu.cn (X. Zhang).
    Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, China. E-mail addresses: huchenglong@hdu.edu.cn (C. Hu),
    First author contact:1 These authors contributed equally to this work.

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 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 (fr=1.52×σ+9.38) between 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