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<p>Magnetoelectric composites are emerging as a promising material solution for spintronic magnetic memory devices, offering high-speed data access and enhanced energy efficiency. Here, we investigate magnetoelectric coupling in polymer-based nanocomposites of polyvinylidene fluoride-trifluoroethylene with magnetostrictive fillers spanning nanoscale to microscale dimensions. We systematically analyze how filler particle size and magnetostriction influence magnetization dynamics, coercivity, and the converse magnetoelectric coefficient. Larger particles (≈5 µm) show superior weighted magnetoelectric coefficients (<i>α</i>’/wt%) relative to nanoscale fillers, attributed to enhanced strain transfer and multi-domain magnetic behavior. Notably, electrical poling promotes magnetization in composites with smaller particles (10–30 nm), inducing a shift from hard-axis to easy-axis magnetization. For spintronic applications, the converse magnetoelectric effect generates magnetic fields up to 32 Oe—two orders of magnitude greater than the switching field required to manipulate free-layer spins in certain spintronic devices, underscoring significant potential for high-performance spintronic applications.</p><p></p>

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Energy-efficient electric control of magnetization in polymer-based magnetoelectrics for spintronic applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月11日

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  • Rui Carvalho,
  • Luís Amorim,
  • Ander Garcia Díez,
  • Clarisse Ribeiro,
  • Senentxu Lanceros-Mendez,
  • Pedro Martins

摘要

Magnetoelectric composites are emerging as a promising material solution for spintronic magnetic memory devices, offering high-speed data access and enhanced energy efficiency. Here, we investigate magnetoelectric coupling in polymer-based nanocomposites of polyvinylidene fluoride-trifluoroethylene with magnetostrictive fillers spanning nanoscale to microscale dimensions. We systematically analyze how filler particle size and magnetostriction influence magnetization dynamics, coercivity, and the converse magnetoelectric coefficient. Larger particles (≈5 µm) show superior weighted magnetoelectric coefficients (α’/wt%) relative to nanoscale fillers, attributed to enhanced strain transfer and multi-domain magnetic behavior. Notably, electrical poling promotes magnetization in composites with smaller particles (10–30 nm), inducing a shift from hard-axis to easy-axis magnetization. For spintronic applications, the converse magnetoelectric effect generates magnetic fields up to 32 Oe—two orders of magnitude greater than the switching field required to manipulate free-layer spins in certain spintronic devices, underscoring significant potential for high-performance spintronic applications.