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<p>Hard–soft magnetic nanocomposites based on SrFe₁₀Al₂O₁₉/Co₀.₈Ni₀.₂Fe₂O₄ were successfully synthesized via a single-step sol–gel auto-combustion route. Structural and phase formation were confirmed by X-ray diffraction, while FTIR and Raman spectroscopy verified phase purity. Microstructural analysis using FESEM and TEM revealed a homogeneous distribution of hard and soft phases. Magnetic measurements indicated an increase in saturation magnetization from 42.5 to 47.0&#xa0;emu/g with increasing soft-phase content. A single peak in the dM/dH curve for the 10 wt% soft-phase composite confirms effective exchange coupling, resulting in a 34.9% enhancement in maximum energy product (<i>BH</i>ₘₐₓ) compared to the pure hard phase. Impedance spectroscopy showed that the dielectric constant increases with soft-phase concentration due to space charge polarization. Nyquist analysis further distinguished grain and grain boundary contributions through equivalent circuit modeling.</p>

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Synergistic enhancement in energy product and dielectric properties of hard/soft magnetic composites

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Gitesh I. Choudhari,
  • Isha Bhasin,
  • K. DamodarReddy,
  • G. Hema Chandra

摘要

Hard–soft magnetic nanocomposites based on SrFe₁₀Al₂O₁₉/Co₀.₈Ni₀.₂Fe₂O₄ were successfully synthesized via a single-step sol–gel auto-combustion route. Structural and phase formation were confirmed by X-ray diffraction, while FTIR and Raman spectroscopy verified phase purity. Microstructural analysis using FESEM and TEM revealed a homogeneous distribution of hard and soft phases. Magnetic measurements indicated an increase in saturation magnetization from 42.5 to 47.0 emu/g with increasing soft-phase content. A single peak in the dM/dH curve for the 10 wt% soft-phase composite confirms effective exchange coupling, resulting in a 34.9% enhancement in maximum energy product (BHₘₐₓ) compared to the pure hard phase. Impedance spectroscopy showed that the dielectric constant increases with soft-phase concentration due to space charge polarization. Nyquist analysis further distinguished grain and grain boundary contributions through equivalent circuit modeling.