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Influence of Co-In Doping in M-Type Barium–Strontium Hexagonal Ferrite on Microwave Absorption

  • Topical Collection: Synthesis and Advanced Characterization of Magnetic Oxides
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Abstract

The present paper deals with the study of microwave absorption properties of cobalt- and indium-doped M-type barium–strontium (Ba0.5Sr0.5CoxInxFe12−2xO19) hexagonal ferrites. The standard ceramic method is used to synthesize Ba0.5Sr0.5CoxInxFe12−2xO19 hexagonal ferrite of varying compositions (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) sintered at 1100°C for pellet formation. The electromagnetic parameters are measured using a vector network analyser in the microwave frequency range (X band, 8–12 GHz). Effects of composition thickness and input impedance with respect to matching frequency are studied. The presence of several reflection loss (RL) peaks at different frequencies is ruled by the impedance mechanisms and/or quarter wavelength mechanism. It is interesting to note that ferrite with x = 0.4 exhibits both mechanisms, and possesses a maximum RL peak of − 32.15 dB at a thickness of 1.6 mm. The other compositions, x = 0.6, 0.8, 1.0, have an absorption bandwidth of − 4.2 GHz spanning over the range 8.2 GHz to 12.4 GHz with − 10 dB wideband absorption. Further, ferrite with x = 0.4 shows an absorption band within 11.22–11.98 GHz with an absorption bandwidth of 0.76 GHz. This narrow band has an absorption strength of – 20 dB when the thickness t = 1.7 mm. In conclusion, absorption bandwidth, and hence microwave absorption, can be tuned by changing the thickness and composition of doped barium–strontium hexagonal ferrites, which can be used for various applications such as shielding, attenuation and fabrication of electromagnetic induction-based flexible absorbing sheets.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, CTIEMT, Shahpur, Jalandhar, Punjab, India

    Harsimrat Kaur

  2. Department of Electronics, G.B. Pant Institute of Engineering and Technology, Pauri Garhwal, Uttarakhand, 246194, India

    K. S. Bhatia

  3. Department of Applied Sciences and Humanities, G.B. Pant Institute of Engineering and Technology, Pauri Garhwal, Uttarakhand, 246194, India

    B. S. Tewari

  4. Department of Applied Sciences, School of Engineering, University of Petroleum and Energy Studies, Dehradun, Uttarakhand, 248007, India

    P. Mandal & A. Dhyani

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  1. Harsimrat Kaur
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Kaur, H., Bhatia, K.S., Tewari, B.S. et al. Influence of Co-In Doping in M-Type Barium–Strontium Hexagonal Ferrite on Microwave Absorption. J. Electron. Mater. 51, 4152–4160 (2022). https://doi.org/10.1007/s11664-022-09731-3

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  • DOI: https://doi.org/10.1007/s11664-022-09731-3

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