Tunable magnetic, dielectric, and optical properties of cobalt ferrite/PVA nanocomposites: Effect of nanoparticle calcination temperature

Authors

  • Noor A. Saeed Department of Applied Physics, College of Applied Science, University of Technology, Baghdad, Iraq
  • Wafaa A. Hussain Department of Applied Physics, College of Applied Science, University of Technology, Baghdad, Iraq
  • Mukhlis M. Ismail Department of Applied Physics, College of Applied Science, University of Technology, Baghdad, Iraq
  • Mudatheer M. Al-Slivani Al-Furqan University, College of Education for Pure Sciences, Department of Physics, Mosul, Iraq

DOI:

https://doi.org/10.17308/kcmf.2026.28/13554

Keywords:

Cobalt ferrite, Nanocomposites, Polyvinyl alcohol (PVA), Magnetic properties, Dielectric constant, Sol-gel

Abstract

Objectives: This study investigates the magnetic and dielectric properties of nanocomposites composed of cobalt ferrite (CoFe2O4) nanoparticles embedded in a polyvinyl alcohol (PVA) matrix.

Experimental: CoFe2O4 nanoparticles were synthesized via a sol-gel auto-combustion method and subsequently calcined at 600 and 900 °C. X-ray diffraction results indicated that increasing the calcination temperature from 600 to 900 °C led to an increase in crystallite size from 23.3 nm to 48.5 nm. This was accompanied by an enhancement in saturation magnetization (Ms) from 68.7 emu/g to 81.3 emu/g and a decrease in coercivity (Hc) from 1150 to 860 Oe.

Conclusions: Most importantly, the PVA/CoFe2O4 composites exhibited enhanced dielectric properties compared to pure PVA. At 100 Hz, the dielectric constant (ε′) of the composite increased from approximately 18 (for PVA/CF600) to 42 (for PVA/CF900), values significantly higher than that of pure PVA, which was approximately 9. This enhancement highlights a synergistic effect between the ferrite nanoparticles and the polymer matrix, opening possibilities for designing composites with tunable dielectric responses for applications such as embedded capacitors and electromagnetic wave absorption devices

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Author Biographies

  • Noor A. Saeed, Department of Applied Physics, College of Applied Science, University of Technology, Baghdad, Iraq

    M.Sc., Assistant Lecturer, Researcher, Department of Applied Physics, College of Applied Science, University of Technology (Baghdad, Iraq).

     

  • Wafaa A. Hussain, Department of Applied Physics, College of Applied Science, University of Technology, Baghdad, Iraq

    PhD, Professor, Department of Applied Physics, College of Applied Science, University of Technology (Baghdad, Iraq).

     

  • Mukhlis M. Ismail, Department of Applied Physics, College of Applied Science, University of Technology, Baghdad, Iraq

    PhD, Professor, Department of Applied Physics, College of Applied Science, University of Technology (Baghdad, Iraq).

     

  • Mudatheer M. Al-Slivani, Al-Furqan University, College of Education for Pure Sciences, Department of Physics, Mosul, Iraq

    M.Sc., Assistant Lecturer,
    Department of Physics, College of Education for Pure
    Sciences, Al-Furqan University (Mosul, Iraq).



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Published

2026-04-01

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Vol. 28 No. 1 (2026)

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Original articles

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Tunable magnetic, dielectric, and optical properties of cobalt ferrite/PVA nanocomposites: Effect of nanoparticle calcination temperature. (2026). Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 28(1), 3-14. https://doi.org/10.17308/kcmf.2026.28/13554