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<p>Strain engineering, based on external or internal stress modulation, has been used for tuning physical properties, for example, in photocatalysis, optoelectronics, and magnetism, but is rarely applied in shielding. In this work, we modulate the shielding response of composites with very low-loading glass-coated ferromagnetic microwires (0.019&#xa0;wt.%) through internal stress relaxation promoted by post-processing treatments, including glass coating removal and current annealing. Glass coating removal resulted in the largest shielding value of ~ 21&#xa0;dB at 10.75&#xa0;GHz due to changes in the magnetic domain structure, anisotropy, and inner core volume, which influenced the rotational remagnetization process and its contribution to magnetic losses. Moreover, the composites achieved an absorption efficiency close to 1, minimizing secondary reflections. Our findings demonstrate a feasible and scalable approach compared to other optimization strategies that involve high filler loading or complex structural designs. It also paves the way to expanding strain engineering to the field of electromagnetics.</p>

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Internal Stress-Driven Electromagnetic Shielding in Glass-Coated Ferromagnetic Microwire Composites

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Diana Estevez,
  • Di Zhou,
  • Xiao Li,
  • Azim Uddin

摘要

Strain engineering, based on external or internal stress modulation, has been used for tuning physical properties, for example, in photocatalysis, optoelectronics, and magnetism, but is rarely applied in shielding. In this work, we modulate the shielding response of composites with very low-loading glass-coated ferromagnetic microwires (0.019 wt.%) through internal stress relaxation promoted by post-processing treatments, including glass coating removal and current annealing. Glass coating removal resulted in the largest shielding value of ~ 21 dB at 10.75 GHz due to changes in the magnetic domain structure, anisotropy, and inner core volume, which influenced the rotational remagnetization process and its contribution to magnetic losses. Moreover, the composites achieved an absorption efficiency close to 1, minimizing secondary reflections. Our findings demonstrate a feasible and scalable approach compared to other optimization strategies that involve high filler loading or complex structural designs. It also paves the way to expanding strain engineering to the field of electromagnetics.