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<p>The growing challenges of electromagnetic pollution and stealth technology have heightened the demand for thin and broadband microwave absorbents. Ferrite represents a promising candidate owing to its natural resonance occurring at GHz frequencies. Here, we tailoring the natural resonance with a high valence Zr<sup>4+</sup> in the flaky BaFe<sub>12</sub>O<sub>19</sub>/Fe<sub>3</sub>O<sub>4</sub> binary phase composite. The introduction of Zr<sup>4+</sup> and the development of a flaky microstructure effectively tunes the magnetocrystalline anisotropy, enabling controlled magnetic resonance behavior, while the in situ growth of Fe<sub>3</sub>O<sub>4</sub> promotes the formation of nanoscale heterostructures that enhance the exchange coupling and interfacial polarizations. This specific structural strategy acts synergistically enhances the impedance matching and electromagnetic attenuation capabilities of the composite. Hence, a minimum reflection loss (<i>RL</i><sub>min</sub>) of − 33&#xa0;dB and an ultra-wide effective absorption bandwidth (EAB) of 9.6&#xa0;GHz (26.5–40&#xa0;GHz) at just 1.05&#xa0;mm was obtained. Consequently, this work thus provides a practical and feasible approach for designing advanced ferrite composite absorbers through the coordinated regulation of magnetic resonance and impedance matching.</p>

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Synthesis of BaFe12−xZrxO19/Fe3O4 binary-phase composites for tunable microwave absorption via magnetic resonance regulation

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Chen Hu,
  • Yujing Zhang,
  • Tao Jiang,
  • Liang Yan,
  • Yilin Zhang,
  • Chuyang Liu,
  • Pan Ying,
  • Xiaopeng Li,
  • Dong-Hyun Kim,
  • Feng Xu

摘要

The growing challenges of electromagnetic pollution and stealth technology have heightened the demand for thin and broadband microwave absorbents. Ferrite represents a promising candidate owing to its natural resonance occurring at GHz frequencies. Here, we tailoring the natural resonance with a high valence Zr4+ in the flaky BaFe12O19/Fe3O4 binary phase composite. The introduction of Zr4+ and the development of a flaky microstructure effectively tunes the magnetocrystalline anisotropy, enabling controlled magnetic resonance behavior, while the in situ growth of Fe3O4 promotes the formation of nanoscale heterostructures that enhance the exchange coupling and interfacial polarizations. This specific structural strategy acts synergistically enhances the impedance matching and electromagnetic attenuation capabilities of the composite. Hence, a minimum reflection loss (RLmin) of − 33 dB and an ultra-wide effective absorption bandwidth (EAB) of 9.6 GHz (26.5–40 GHz) at just 1.05 mm was obtained. Consequently, this work thus provides a practical and feasible approach for designing advanced ferrite composite absorbers through the coordinated regulation of magnetic resonance and impedance matching.