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<p>With the rapid growth of telecommunications, electromagnetic pollution and interference (EMI) have become critical challenges. This study developed barium hexaferrite-based nanocomposites doped with Ti, Co, Mn, and Ni to enhance EMI shielding capabilities. The nanocomposites (BaFe<sub>12</sub>O<sub>19</sub> and the modified BaTiCoMn<sub>0.25</sub>Ni<sub>0.25</sub>Fe<sub>10</sub>O<sub>19</sub>) were synthesized using mechanical milling and thermal processing. Advanced analytical techniques such as x-ray diffraction, scanning and transmission electron microscopy, and vector network analysis confirmed the successful incorporation of dopants and revealed remarkable improvements. The BaTiCoMn<sub>0.25</sub>Ni<sub>0.25</sub>Fe<sub>10</sub>O<sub>19</sub> variant exhibited enhanced magnetic properties with a coercivity of 308.9 Oe and magnetization of 65.9&#xa0;emu/g, surpassing BaFe<sub>12</sub>O<sub>19</sub>. The optical band gap was increased to 2.3&#xa0;eV, suitable for high-energy applications. The nanocomposite demonstrated superior EMI shielding, achieving a reflection loss of&#xa0;−&#xa0;25.0&#xa0;dB at 10.5&#xa0;GHz and shielding effectiveness up to&#xa0;−&#xa0;45.0&#xa0;dB in the X-band (8.0–12.0&#xa0;GHz), making it highly efficient for advanced EMI shielding in electronics and telecommunications.</p>

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Magnetic, Morphological, Optical, and EMI Shielding Assessment of Ti, Co, Mn, and Ni-Doped Barium Hexaferrite Nanocomposites for X-Band Applications

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Kamil Kayode Katibi,
  • Rabaah Syahidah Azis,
  • Chen Hongxu,
  • Ibrahim Garba Shitu,
  • Ismayadi Ismail,
  • Farah Diana Muhammad,
  • Chan Kar Tim,
  • Nur Biha Binti Mohamed Nafis

摘要

With the rapid growth of telecommunications, electromagnetic pollution and interference (EMI) have become critical challenges. This study developed barium hexaferrite-based nanocomposites doped with Ti, Co, Mn, and Ni to enhance EMI shielding capabilities. The nanocomposites (BaFe12O19 and the modified BaTiCoMn0.25Ni0.25Fe10O19) were synthesized using mechanical milling and thermal processing. Advanced analytical techniques such as x-ray diffraction, scanning and transmission electron microscopy, and vector network analysis confirmed the successful incorporation of dopants and revealed remarkable improvements. The BaTiCoMn0.25Ni0.25Fe10O19 variant exhibited enhanced magnetic properties with a coercivity of 308.9 Oe and magnetization of 65.9 emu/g, surpassing BaFe12O19. The optical band gap was increased to 2.3 eV, suitable for high-energy applications. The nanocomposite demonstrated superior EMI shielding, achieving a reflection loss of − 25.0 dB at 10.5 GHz and shielding effectiveness up to − 45.0 dB in the X-band (8.0–12.0 GHz), making it highly efficient for advanced EMI shielding in electronics and telecommunications.