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<p>Co-Zn co-doped M-type hexaferrites SrCo<sub><i>y</i></sub>Zn<sub><i>y</i></sub>Fe<sub>12−2<i>y</i></sub>O<sub>19</sub> have been developed employing the sol–gel method. X-ray diffraction (XRD) was carried out to analyze the phase purity, and scanning electron microscopy (SEM) was used to investigate the morphology of the developed ferrite. The magnetic characterization was performed by determining various magnetic parameters including saturation magnetization (<i>M</i><sub>s</sub>), coercivity (<i>H</i><sub>c</sub>), remanence (<i>M</i><sub>r</sub>), and anisotropy field (<i>H</i><sub>a</sub>). The microwave absorption performance was investigated by utilizing reflection loss (RL) versus frequency graphs. The impact of relaxation peaks in complex permittivity/permeability and eddy current loss on absorption performance has also been investigated. The crystallite size reduces with the increase in the doping level of Co-Zn and ranges between 38.77&#xa0;nm and 26.42&#xa0;nm. Morphology suggested good inter-grain connectivity with decreased particle size at a higher doping level. A decrease in coercivity (<i>H</i><sub>c</sub>) from 3026 Oe to 948 Oe was observed. On a similar note, saturation magnetization (<i>M</i><sub>s</sub>) decreased from 90.29&#xa0;emu/g to 76.59&#xa0;emu/g. Absorption characteristics were enhanced by doping with Zn<sup>2+</sup> and Co<sup>2+</sup>. The highest RL of −41.72&#xa0;dB at a thickness of 1.9&#xa0;mm with an input impedance (<i>Z</i><sub>in</sub>) of 379.55&#xa0;Ω (<i>Z</i><sub>real</sub> = 379.50&#xa0;Ω, <i>Z</i><sub>img</sub> = −5.68&#xa0;Ω) was obtained for <i>y</i> = 1.0. It also possessed the highest bandwidth of 2.02&#xa0;GHz among all the compositions. The developed ferrites can be the prime applicant as an absorber in the field of defense and commercial applications due to their broad bandwidth, low thickness, and high absorption.</p>

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Development of Co2+ and Zn2+ Co-Doped Hexaferrites for Microwave Applications: Structural, Magnetic, and Absorption Traits

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Sayed Tathir Abbas Naqvi,
  • Sachin Kumar Godara,
  • Bishakha Ray,
  • Suwarna Datar,
  • Charanjeet Singh

摘要

Co-Zn co-doped M-type hexaferrites SrCoyZnyFe12−2yO19 have been developed employing the sol–gel method. X-ray diffraction (XRD) was carried out to analyze the phase purity, and scanning electron microscopy (SEM) was used to investigate the morphology of the developed ferrite. The magnetic characterization was performed by determining various magnetic parameters including saturation magnetization (Ms), coercivity (Hc), remanence (Mr), and anisotropy field (Ha). The microwave absorption performance was investigated by utilizing reflection loss (RL) versus frequency graphs. The impact of relaxation peaks in complex permittivity/permeability and eddy current loss on absorption performance has also been investigated. The crystallite size reduces with the increase in the doping level of Co-Zn and ranges between 38.77 nm and 26.42 nm. Morphology suggested good inter-grain connectivity with decreased particle size at a higher doping level. A decrease in coercivity (Hc) from 3026 Oe to 948 Oe was observed. On a similar note, saturation magnetization (Ms) decreased from 90.29 emu/g to 76.59 emu/g. Absorption characteristics were enhanced by doping with Zn2+ and Co2+. The highest RL of −41.72 dB at a thickness of 1.9 mm with an input impedance (Zin) of 379.55 Ω (Zreal = 379.50 Ω, Zimg = −5.68 Ω) was obtained for y = 1.0. It also possessed the highest bandwidth of 2.02 GHz among all the compositions. The developed ferrites can be the prime applicant as an absorber in the field of defense and commercial applications due to their broad bandwidth, low thickness, and high absorption.