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<p>This research investigates the influence of substrate temperature on the structural, optical, and magnetic properties of cobalt ferrite (CoFe₂O₄) thin films synthesized via ultrasonic spray pyrolysis. The films were deposited across a temperature range of 250°C to 450°C and subjected to comprehensive characterization encompassing structural, morphological, optical, and magnetic analyses. The results reveal that crystallite size initially increases with substrate temperature before decreasing, with intermediate temperatures yielding optimal structural order and minimal defects. Concurrently, the optical bandgap decreases from 2.54 eV to 2.13 eV as improvements in microstructure coincide with an increase in defect states. Magnetic measurements indicate significant enhancements in saturation magnetization and magnetic anisotropy at higher deposition temperatures, attributed to cation redistribution and the generation of oxygen vacancies. These findings highlight the critical role of substrate temperature in tailoring the properties of CoFe₂O₄ thin films, offering valuable insights for their application in magnetic devices, optoelectronics, energy storage systems, and biomedical technologies.</p>

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Tailoring structural, optical, and magnetic properties of CoFe2O4 thin films using ultrasonic spray pyrolysis

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Hani Hadjoudja,
  • Charafeddine Sedrati,
  • Hichem Sedrati,
  • Safia Alleg,
  • Nouari Kebaili

摘要

This research investigates the influence of substrate temperature on the structural, optical, and magnetic properties of cobalt ferrite (CoFe₂O₄) thin films synthesized via ultrasonic spray pyrolysis. The films were deposited across a temperature range of 250°C to 450°C and subjected to comprehensive characterization encompassing structural, morphological, optical, and magnetic analyses. The results reveal that crystallite size initially increases with substrate temperature before decreasing, with intermediate temperatures yielding optimal structural order and minimal defects. Concurrently, the optical bandgap decreases from 2.54 eV to 2.13 eV as improvements in microstructure coincide with an increase in defect states. Magnetic measurements indicate significant enhancements in saturation magnetization and magnetic anisotropy at higher deposition temperatures, attributed to cation redistribution and the generation of oxygen vacancies. These findings highlight the critical role of substrate temperature in tailoring the properties of CoFe₂O₄ thin films, offering valuable insights for their application in magnetic devices, optoelectronics, energy storage systems, and biomedical technologies.