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<p>Soft magnetic metallic absorbers exhibit high saturation magnetization, low coercivity, and high magnetic permeability, which significantly enhance the magnetic loss capacity in the low-frequency region. However, impedance mismatch issues in magnetic metals remain challenging. In this study, a controlled-thickness aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) nanocoating is deposited on iron (Fe) powder surfaces via an atomic layer deposition (ALD) strategy, forming a unique Fe@Al<sub>2</sub>O<sub>3</sub> core-shell structure. By precisely regulating the nanocoating thickness, the synergistic mechanism of interface polarization and magnetic loss is regulated, achieving highly efficient electromagnetic wave absorption (EMWA). At the low-frequency band (4.63 GHz), the reflection loss (<i>RL</i>) of Fe60Q (60 cycles) reaches − 56.32 dB, and the effective absorption bandwidth (EAB) of Fe40Q (40 cycles) achieves 6.46 GHz (10.65-17.11 GHz). Additionally, the Al<sub>2</sub>O<sub>3</sub> coating significantly enhances corrosion resistance, elevating the self-corrosion potential (<i>E</i><sub>corr</sub>) from − 0.904 V to − 0.409 V and reducing the corrosion current density (<i>I</i><sub>corr</sub>) from 0.94 to 0.35 μA/cm<sup>2</sup>. Overall, these results indicate that the ALD-grown nanocoating strategy simultaneously improves both the low-frequency EMWA performance and chemical stability of magnetic materials.</p>

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Core-Shell Structure Fe@Al2O3 Absorber for High-Performance Electromagnetic Wave Absorption

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Wei Gong,
  • Zhaobo Feng,
  • Tao Wang,
  • Xian Wang,
  • Shenglin Jiang

摘要

Soft magnetic metallic absorbers exhibit high saturation magnetization, low coercivity, and high magnetic permeability, which significantly enhance the magnetic loss capacity in the low-frequency region. However, impedance mismatch issues in magnetic metals remain challenging. In this study, a controlled-thickness aluminum oxide (Al2O3) nanocoating is deposited on iron (Fe) powder surfaces via an atomic layer deposition (ALD) strategy, forming a unique Fe@Al2O3 core-shell structure. By precisely regulating the nanocoating thickness, the synergistic mechanism of interface polarization and magnetic loss is regulated, achieving highly efficient electromagnetic wave absorption (EMWA). At the low-frequency band (4.63 GHz), the reflection loss (RL) of Fe60Q (60 cycles) reaches − 56.32 dB, and the effective absorption bandwidth (EAB) of Fe40Q (40 cycles) achieves 6.46 GHz (10.65-17.11 GHz). Additionally, the Al2O3 coating significantly enhances corrosion resistance, elevating the self-corrosion potential (Ecorr) from − 0.904 V to − 0.409 V and reducing the corrosion current density (Icorr) from 0.94 to 0.35 μA/cm2. Overall, these results indicate that the ALD-grown nanocoating strategy simultaneously improves both the low-frequency EMWA performance and chemical stability of magnetic materials.