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<p>Realizing two-dimensional multiferroics with robust magnetoelectric coupling for electric-field-controlled magnetism at room temperature poses substantial challenges, as ferroelectricity and magnetism inherently conflict. Here we report air-stable bilayer CrTe<sub>2</sub> that exhibits intrinsic room-temperature multiferroicity. Structural and magnetic characterization reveals an alternating ferromagnetic and antiferromagnetic bilayer architecture, driven by interlayer charge transfer that spontaneously breaks inversion symmetry and generates a switchable out-of-plane ferroelectric polarization. Scanning probe microscopy confirms the non-volatile control of magnetization states with an electric field, enabling electrical writing and magnetic reading functionalities. This mechanism, rooted in interlayer charge transfer, rather than conventional spin-orbit coupling, provides a foundation for engineering multiferroics with layered systems. The demonstration of a two-dimensional multiferroic material with magnetoelectric coupling under ambient conditions provides opportunities for energy-efficient memory devices and quantum sensing technologies.</p>

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Room-temperature two-dimensional multiferroic metal with voltage-controllable magnetic order

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Dacheng Tian,
  • Shulin Zhong,
  • Jianyu Dong,
  • Song Zhou,
  • Zhiwen Liu,
  • Kai Chen,
  • Wenhua Zhang,
  • Liang Cao,
  • Xiaoyue He,
  • Xiu Li,
  • Tengyu Guo,
  • Kunrong Du,
  • Haifeng Feng,
  • Yu Wang,
  • Peng Cheng,
  • Yiqi Zhang,
  • Baojie Feng,
  • Kehui Wu,
  • Suhuai Wei,
  • Yi Du,
  • Yunhao Lu,
  • Lan Chen

摘要

Realizing two-dimensional multiferroics with robust magnetoelectric coupling for electric-field-controlled magnetism at room temperature poses substantial challenges, as ferroelectricity and magnetism inherently conflict. Here we report air-stable bilayer CrTe2 that exhibits intrinsic room-temperature multiferroicity. Structural and magnetic characterization reveals an alternating ferromagnetic and antiferromagnetic bilayer architecture, driven by interlayer charge transfer that spontaneously breaks inversion symmetry and generates a switchable out-of-plane ferroelectric polarization. Scanning probe microscopy confirms the non-volatile control of magnetization states with an electric field, enabling electrical writing and magnetic reading functionalities. This mechanism, rooted in interlayer charge transfer, rather than conventional spin-orbit coupling, provides a foundation for engineering multiferroics with layered systems. The demonstration of a two-dimensional multiferroic material with magnetoelectric coupling under ambient conditions provides opportunities for energy-efficient memory devices and quantum sensing technologies.