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<p>Control of magnetism through voltage-driven ionic processes (<i>i.e</i>., magneto-ionics) holds potential for next-generation memories and computing. This stems from its non-volatility, flexibility in adjusting the magnitude and speed of magnetic modulation, and energy efficiency. Since magneto-ionics depends on factors like ionic radius and electronegativity, identifying alternative mobile ions is crucial to embrace new phenomena and applications. Here, the feasibility of C as a prospective magneto-ionic ion is investigated in a Fe-C system by electrolyte gating. In contrast to most magneto-ionic systems, Fe-C presents a reversible dual-ion mechanism: Fe and C act as cation and anion, respectively, moving uniformly in opposite directions under an applied electric field. This leads to a significant increase in saturation magnetization ( &gt; 5-fold) with magneto-ionic rates larger than 1 emu·cm<sup>−3</sup>·s<sup>−1</sup>, and a 25-fold increase in coercivity. Since carbides exhibit minimal cytotoxicity, this introduces a biocompatible dimension to magneto-ionics, paving the way for the convergence of spintronics and biotechnology.</p>

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Magneto-ionic control of magnetism through voltage-driven carbon transport

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月13日

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  • Z. Tan,
  • Z. Ma,
  • S. Privitera,
  • M. O. Liedke,
  • E. Hirschmann,
  • A. Wagner,
  • J. L. Costa-Krämer,
  • A. Quintana,
  • A. Garcia-Tort,
  • J. Herrero-Martín,
  • Y. F. Mei,
  • X. Z. Chen,
  • H. Tan,
  • I. Fina,
  • F. Sánchez,
  • A. Arredondo-López,
  • F. Ibrahim,
  • M. Chshiev,
  • E. Longo,
  • M. Rovirola,
  • F. Macià,
  • A. F. Lopeandia,
  • J. Nogués,
  • E. Pellicer,
  • J. Sort,
  • E. Menéndez

摘要

Control of magnetism through voltage-driven ionic processes (i.e., magneto-ionics) holds potential for next-generation memories and computing. This stems from its non-volatility, flexibility in adjusting the magnitude and speed of magnetic modulation, and energy efficiency. Since magneto-ionics depends on factors like ionic radius and electronegativity, identifying alternative mobile ions is crucial to embrace new phenomena and applications. Here, the feasibility of C as a prospective magneto-ionic ion is investigated in a Fe-C system by electrolyte gating. In contrast to most magneto-ionic systems, Fe-C presents a reversible dual-ion mechanism: Fe and C act as cation and anion, respectively, moving uniformly in opposite directions under an applied electric field. This leads to a significant increase in saturation magnetization ( > 5-fold) with magneto-ionic rates larger than 1 emu·cm−3·s−1, and a 25-fold increase in coercivity. Since carbides exhibit minimal cytotoxicity, this introduces a biocompatible dimension to magneto-ionics, paving the way for the convergence of spintronics and biotechnology.