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<p>Multiferroic fluids offer a promising route toward tunable magnetoelectric coupling; however, their practical application is restricted by weak interfacial polarization and poor colloidal stability. Herein, we propose an interfacial engineering strategy using silane surfactants with distinct functional groups to regulate the performance of Co–Ti co-doped strontium hexaferrite (SrFe<sub>8</sub>Co<sub>2</sub>Ti<sub>2</sub>O<sub>19</sub>)-based multiferroic fluids. The results demonstrate that interfacial chemistry plays a decisive role in modulating particle interactions and charge transport pathways, simultaneously optimizing dispersion stability and magnetoelectric coupling performance. Amino-functional ionic silane surfactants can form strong interfacial bonds with ferrite particles and endow the system with electrostatic stabilization, which greatly enhances interfacial polarization and dynamic charge coupling. Eventually, an ultrahigh magnetoelectric coupling coefficient of 189.48&#xa0;mV/(cm·Oe) is obtained. Meanwhile, the ferroelectric response and magnetodielectric properties of the fluids are also improved. The performance enhancement is attributed to the synergistic effect of interfacial polarization, magnetic-field-induced particle rearrangement and spin–lattice interaction of the ferrite material. This work verifies that interfacial chemistry can be adopted as a universal design strategy for high-performance multiferroic fluids.</p>

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Surfactant-regulated magnetoelectric coupling in SrFe8Co2Ti2O19-based multiferroic fluids

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Jianghai Wang,
  • Shubao Yang,
  • Xiaoling Deng,
  • Huan Li,
  • Rongli Gao,
  • Wei Cai,
  • Chunlin Fu

摘要

Multiferroic fluids offer a promising route toward tunable magnetoelectric coupling; however, their practical application is restricted by weak interfacial polarization and poor colloidal stability. Herein, we propose an interfacial engineering strategy using silane surfactants with distinct functional groups to regulate the performance of Co–Ti co-doped strontium hexaferrite (SrFe8Co2Ti2O19)-based multiferroic fluids. The results demonstrate that interfacial chemistry plays a decisive role in modulating particle interactions and charge transport pathways, simultaneously optimizing dispersion stability and magnetoelectric coupling performance. Amino-functional ionic silane surfactants can form strong interfacial bonds with ferrite particles and endow the system with electrostatic stabilization, which greatly enhances interfacial polarization and dynamic charge coupling. Eventually, an ultrahigh magnetoelectric coupling coefficient of 189.48 mV/(cm·Oe) is obtained. Meanwhile, the ferroelectric response and magnetodielectric properties of the fluids are also improved. The performance enhancement is attributed to the synergistic effect of interfacial polarization, magnetic-field-induced particle rearrangement and spin–lattice interaction of the ferrite material. This work verifies that interfacial chemistry can be adopted as a universal design strategy for high-performance multiferroic fluids.