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<p>To meet the growing demand for multifunctional materials in advanced microelectronic and spintronic applications, we have developed a magneto-dielectric (MD) nanocomposite system comprising (Ni<sub>0.5</sub>Zn<sub>0.5</sub>Fe<sub>1.97</sub>Ce<sub>0.03</sub>O<sub>4</sub>)<sub>0.5</sub>(TiO<sub>2</sub>)<sub>0.5</sub> (NZFCO@TO). The composite was synthesized using the sol-gel method by integrating Ce<sup>3+</sup>-doped Ni-Zn ferrite as the magnetic component with TiO<sub>2</sub> as the dielectric matrix. Structural analysis via Rietveld refinement of X-ray diffraction patterns confirmed the formation of the desired phases with well-defined microstructural parameters. Transmission electron microscopy revealed uniformly distributed spherical grains with an average particle size of ~ 13.2&#xa0;nm. X-ray photoelectron spectroscopy provided insight into the valence states of the constituent ions. Magnetic measurements demonstrated ferrimagnetic ordering along with superparamagnetic relaxation behavior in both NZFCO and NZFCO@TO, with a high value (20.25 emu/gm) of maximum magnetization at room temperature in NZFCO@TO. Notably, the NZFCO@TO composite exhibited a significantly enhanced dielectric constant (ε′ ≈ 1874.14) and reduced leakage loss (0.07 − 0.04) compared to the undoped system. Furthermore, a magneto-dielectric coupling of ~ 3% was observed, underscoring the potential of this nanocomposite for applications in magnetic field sensors, spintronic components, and next-generation electronic devices.</p>

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Structural, magnetic, and dielectric behaviour of Ce3+ doped Ni-Zn ferrite/TiO2 magneto-dielectric nanocomposites

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Sujay Das,
  • Madhumita Dalal,
  • Ayan Mitra,
  • Ayan Mallick,
  • Nupur Bhakta,
  • Anna Bajorek,
  • Pabitra Kumar Chakrabarti

摘要

To meet the growing demand for multifunctional materials in advanced microelectronic and spintronic applications, we have developed a magneto-dielectric (MD) nanocomposite system comprising (Ni0.5Zn0.5Fe1.97Ce0.03O4)0.5(TiO2)0.5 (NZFCO@TO). The composite was synthesized using the sol-gel method by integrating Ce3+-doped Ni-Zn ferrite as the magnetic component with TiO2 as the dielectric matrix. Structural analysis via Rietveld refinement of X-ray diffraction patterns confirmed the formation of the desired phases with well-defined microstructural parameters. Transmission electron microscopy revealed uniformly distributed spherical grains with an average particle size of ~ 13.2 nm. X-ray photoelectron spectroscopy provided insight into the valence states of the constituent ions. Magnetic measurements demonstrated ferrimagnetic ordering along with superparamagnetic relaxation behavior in both NZFCO and NZFCO@TO, with a high value (20.25 emu/gm) of maximum magnetization at room temperature in NZFCO@TO. Notably, the NZFCO@TO composite exhibited a significantly enhanced dielectric constant (ε′ ≈ 1874.14) and reduced leakage loss (0.07 − 0.04) compared to the undoped system. Furthermore, a magneto-dielectric coupling of ~ 3% was observed, underscoring the potential of this nanocomposite for applications in magnetic field sensors, spintronic components, and next-generation electronic devices.