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<p>Garnet integrated multiferroic composites of xGd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> (GGG)—(1-x)GaFe<sub>0.95</sub>Co<sub>0.05</sub>O<sub>3</sub> (GFCO5), with varying garnet concentrations (x = 0.0,0.1,0.2, and 0.3), are studied to improve their magnetodielectric coupling. Rietveld refinement confirms the coexistence of orthorhombic GFCO5 and cubic GGG phases, with scanning electron microscopy revealing a decrease in average grain size of GFCO5 as GGG concentration increases. Incorporation of GGG significantly reduces leakage current density, with the x = 0.2 composition exhibiting a five-order suppression relative to pristine GFCO5, primarily due to higher grain boundary resistance and grain boundary limited conduction mechanism. Dielectric measurements show systematic reductions in dielectric tangent loss with increasing GGG concentration, consistent with improved insulating behaviour. Magnetic studies demonstrate the highest room temperature magnetization for x = 0.1 composite and magnetodielectric coupling of ~ 8.56% at 9kOe, indicating optimal magnetic and electric coupling at this concentration. These results establish GGG–GFCO5 composites as potential multifunctional materials for next generation magnetoelectric devices by simultaneously suppressing leakage current and enhancing magnetodielectric coupling.</p>

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Leakage current suppression and enhanced magnetodielectric response in multiferroic GaFe0.95Co0.05O3 with garnet Gd3Ga5O12 composites

  • 期刊论文

  • 发表日期：

    2026年6月14日

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  • Ishita Jana,
  • Swarnali Hait,
  • Kalyan Mandal

摘要

Garnet integrated multiferroic composites of xGd3Ga5O12 (GGG)—(1-x)GaFe0.95Co0.05O3 (GFCO5), with varying garnet concentrations (x = 0.0,0.1,0.2, and 0.3), are studied to improve their magnetodielectric coupling. Rietveld refinement confirms the coexistence of orthorhombic GFCO5 and cubic GGG phases, with scanning electron microscopy revealing a decrease in average grain size of GFCO5 as GGG concentration increases. Incorporation of GGG significantly reduces leakage current density, with the x = 0.2 composition exhibiting a five-order suppression relative to pristine GFCO5, primarily due to higher grain boundary resistance and grain boundary limited conduction mechanism. Dielectric measurements show systematic reductions in dielectric tangent loss with increasing GGG concentration, consistent with improved insulating behaviour. Magnetic studies demonstrate the highest room temperature magnetization for x = 0.1 composite and magnetodielectric coupling of ~ 8.56% at 9kOe, indicating optimal magnetic and electric coupling at this concentration. These results establish GGG–GFCO5 composites as potential multifunctional materials for next generation magnetoelectric devices by simultaneously suppressing leakage current and enhancing magnetodielectric coupling.