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<p>Multiferroic composites of <i>x</i>CoFe<sub>2</sub>O<sub>4</sub>/(1-<i>x</i>)(0.5Ba(Zr<sub>0.2</sub>Ti<sub>0.8</sub>)O<sub>3</sub>–0.5(Ba<sub>0.7</sub>Ca<sub>0.3</sub>)TiO<sub>3</sub>) with <i>x</i> = 0–1.0 (denoted as CFO/BZT-BCT) and an average particle size of 100&#xa0;nm were prepared by high-energy ball milling combined with the thermal annealing methods. The X-ray diffraction shows a co-existence of the ferromagnetic phase of CFO and the ferroelectric phase of BZT-BCT. Our observations indicate that saturation, remanence, and coercivity progressively increase with increasing CFO content, specifically from <i>x</i> = 0 to <i>x</i> = 0.8. At <i>x</i> = 0.2, the maximum electric polarization, remanent electric polarization, coercivity and electric power loss density reach their maximum values of ~ 0.25 <i>µ</i>C/cm², 0.08 <i>µ</i>C/cm², 3.6&#xa0;kV/cm and 0.156&#xa0;mJ/cm³, respectively, for an applied electric field less than 12.5&#xa0;kV/cm. These multiferroic composites demonstrate excellent electromagnetic wave absorption capabilities from 2 to 18&#xa0;GHz. With a sample thickness of 2&#xa0;mm, a minimum reflection loss of -41.17 dB was observed at 12.07&#xa0;GHz. The effective absorption bandwidth for this sample is greater than 12.1&#xa0;GHz, indicating optimal impedance and attenuation matching and effective absorption of electromagnetic waves throughout the X and K<sub>u</sub> frequency bands. These outcomes reveal the capability for wideband absorption uses in radar invisibility technology and electromagnetic insulation.</p>

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Wideband electromagnetic wave absorption in multiferroic composite materials based on perovskite structures

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Dao Son Lam,
  • Ngo My Hoa,
  • Bui Xuan Khuyen,
  • Ngo Thu Huong,
  • Nguyen Ngoc Tung,
  • Nguyen Minh Hieu,
  • Pham Xuan Thao,
  • Bui Son Tung

摘要

Multiferroic composites of xCoFe2O4/(1-x)(0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3) with x = 0–1.0 (denoted as CFO/BZT-BCT) and an average particle size of 100 nm were prepared by high-energy ball milling combined with the thermal annealing methods. The X-ray diffraction shows a co-existence of the ferromagnetic phase of CFO and the ferroelectric phase of BZT-BCT. Our observations indicate that saturation, remanence, and coercivity progressively increase with increasing CFO content, specifically from x = 0 to x = 0.8. At x = 0.2, the maximum electric polarization, remanent electric polarization, coercivity and electric power loss density reach their maximum values of ~ 0.25 µC/cm², 0.08 µC/cm², 3.6 kV/cm and 0.156 mJ/cm³, respectively, for an applied electric field less than 12.5 kV/cm. These multiferroic composites demonstrate excellent electromagnetic wave absorption capabilities from 2 to 18 GHz. With a sample thickness of 2 mm, a minimum reflection loss of -41.17 dB was observed at 12.07 GHz. The effective absorption bandwidth for this sample is greater than 12.1 GHz, indicating optimal impedance and attenuation matching and effective absorption of electromagnetic waves throughout the X and Ku frequency bands. These outcomes reveal the capability for wideband absorption uses in radar invisibility technology and electromagnetic insulation.