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<p>Two distinct Rare Earth (RE) element doped cobalt nano ferrite compounds CoFe<sub>1.95</sub>Sm<sub>0.05</sub>O<sub>4</sub> and CoFe<sub>1.95</sub>Gd<sub>0.05</sub>O<sub>4</sub> were synthesized using the sol–gel method without using an organic gelation agent and investigated their optical, structural, and magnetic properties. Rietveld’s study of XRD noted the formation of a single-phase cubic <i>Fd-3m</i> spinel structure. SEM EDS confirms the presence of all elements as per the composition. CoFe<sub>1.95</sub>Sm<sub>0.05</sub>O<sub>4</sub> shows lower band gap value than CoFe<sub>1.95</sub>Gd<sub>0.05</sub>O<sub>4</sub> which were measured from UV-Visible spectra. FTIR spectra confirmed the presence of characteristic spinel vibrations. Magnetic parameters were measured by using M vs H and M vs 1/H<sup>2</sup> spectra from vibrating sample magnetometer (VSM measurements). The M<sub>s</sub> (saturation magnetization) values were 51.51 emu/g and 47.86 emu/g for CoFe<sub>1.95</sub>Sm<sub>0</sub>.<sub>05</sub>O<sub>4</sub> and CoFe<sub>1.95</sub>Gd<sub>0.05</sub>O<sub>4</sub> respectively. The higher coercivity values i.e., 2062 Oe for CoFe<sub>1.95</sub>Sm<sub>0.05</sub>O<sub>4</sub> and 2697 Oe for CoFe<sub>1.95</sub>Gd<sub>0.05</sub>O<sub>4</sub> were observed compared to literature. The prepared RE-doped cobalt nano ferrite materials offer promising applications for functional devices and enhanced magnetic properties of the composites.</p> Graphical Abstract <p></p>

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Improved magnetic properties of sol–gel prepared CoFe1.95Sm0.05O4 and CoFe1.95Gd0.05O4 ferrites

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • M. Siddeshwar,
  • Kanchana Latha Chittury,
  • V. Rama Devi,
  • Puli Nageswar Rao,
  • T. Ramesh,
  • P. Sowjanya,
  • Nehru Boda,
  • N. Pavan Kumar

摘要

Two distinct Rare Earth (RE) element doped cobalt nano ferrite compounds CoFe1.95Sm0.05O4 and CoFe1.95Gd0.05O4 were synthesized using the sol–gel method without using an organic gelation agent and investigated their optical, structural, and magnetic properties. Rietveld’s study of XRD noted the formation of a single-phase cubic Fd-3m spinel structure. SEM EDS confirms the presence of all elements as per the composition. CoFe1.95Sm0.05O4 shows lower band gap value than CoFe1.95Gd0.05O4 which were measured from UV-Visible spectra. FTIR spectra confirmed the presence of characteristic spinel vibrations. Magnetic parameters were measured by using M vs H and M vs 1/H2 spectra from vibrating sample magnetometer (VSM measurements). The Ms (saturation magnetization) values were 51.51 emu/g and 47.86 emu/g for CoFe1.95Sm0.05O4 and CoFe1.95Gd0.05O4 respectively. The higher coercivity values i.e., 2062 Oe for CoFe1.95Sm0.05O4 and 2697 Oe for CoFe1.95Gd0.05O4 were observed compared to literature. The prepared RE-doped cobalt nano ferrite materials offer promising applications for functional devices and enhanced magnetic properties of the composites.

Graphical Abstract