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<p>Multiferroic properties in pure and Dy<sup>3+</sup>-doped BiFeO₃ ceramics [Bi<sub>1-x</sub>Dy<sub>x</sub>FeO<sub>3</sub> (<i>x</i> = 0, 0.01, 0.03, 0.05&#xa0;mole%)] were systematically investigated. The samples were synthesized via a citrate–nitrate auto-combustion route. The room-temperature magnetization measurements confirmed the weak magnetism in 5&#xa0;mol% Dy<sup>3+</sup>-doped BFO, which is further confirmed in temperature-dependent magnetization where ferromagnetic behavior evolves below the Néel temperature (T<sub>N</sub> = 645&#xa0;K), consistent with differential scanning calorimetry results. However, pure as well as other doped compositions did not reveal such behavior. We present a comparative Raman spectral analysis of the A<sub>1</sub> phonon mode (Bi–O vibration) exhibiting a sharp anomaly in the 5&#xa0;mol% Dy<sup>3+</sup>-substituted sample, signifying strong spin–phonon coupling as supported by the Δω versus [M<sub>sublattice</sub>(T)/M<sub>s</sub>]<sup>2</sup> relation following Granado et al. [<CitationRef CitationID="CR1">1</CitationRef>]<i>.</i> Furthermore, temperature-dependent PE loop measurements evidenced a distinct magnetic-field-induced modification of polarization near T<sub>N</sub>, confirming the presence of magnetoelectric coupling in 5&#xa0;mol% Dy<sup>3+</sup>-doped BFO; however, such behavior in pure BFO was absent.</p>

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Observation of magnetoelectric coupling via PE loop measurement near Néel temperature in rare-earth-doped BFO ceramics

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Anand P. S. Gaur,
  • Reena Verma,
  • Himanshu Payal,
  • Balram Tripathi

摘要

Multiferroic properties in pure and Dy3+-doped BiFeO₃ ceramics [Bi1-xDyxFeO3 (x = 0, 0.01, 0.03, 0.05 mole%)] were systematically investigated. The samples were synthesized via a citrate–nitrate auto-combustion route. The room-temperature magnetization measurements confirmed the weak magnetism in 5 mol% Dy3+-doped BFO, which is further confirmed in temperature-dependent magnetization where ferromagnetic behavior evolves below the Néel temperature (TN = 645 K), consistent with differential scanning calorimetry results. However, pure as well as other doped compositions did not reveal such behavior. We present a comparative Raman spectral analysis of the A1 phonon mode (Bi–O vibration) exhibiting a sharp anomaly in the 5 mol% Dy3+-substituted sample, signifying strong spin–phonon coupling as supported by the Δω versus [Msublattice(T)/Ms]2 relation following Granado et al. [1]. Furthermore, temperature-dependent PE loop measurements evidenced a distinct magnetic-field-induced modification of polarization near TN, confirming the presence of magnetoelectric coupling in 5 mol% Dy3+-doped BFO; however, such behavior in pure BFO was absent.