利用石墨烯异质结构对二维反铁磁体中亚尼尔自旋动力学的电学探测
Electrical Probing of Sub-Néel Spin Dynamics in Two-Dimensional Antiferromagnets Using Graphene Heterostructures
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中文总结 AI 辅助
本研究利用石墨烯与FePS$_3$异质结构，通过低温输运测量和密度泛函理论计算，实现了对二维反铁磁体中隐藏自旋动力学的电学探测，为自旋动力学读出提供了新平台。
中文摘要 AI 辅助
低维反铁磁范德华材料已成为探索奇异自旋动力学和磁相的多功能平台，然而由于其净磁化强度消失且高度绝缘，电学访问这些现象仍是一个重大挑战。在此，我们证明石墨烯可以作为二维反铁磁体中隐藏自旋动力学的超灵敏电学换能器。通过将石墨烯与范德华反铁磁体FePS$_3$集成，低温输运测量结合磁场和栅极电压控制揭示了远低于尼尔温度的多重电阻异常。它们不同的温度、磁场和载流子密度依赖性使我们能够将这些异常与磁振子激发以及反铁磁态的低温柔磁重排相关联，而这两者对于传统磁力测量而言在很大程度上仍难以触及。密度泛函理论计算进一步表明，FePS$_3$中竞争的反铁磁自旋构型在能量上近乎简并，同时在相邻石墨烯层中产生显著不同的电子响应。这些特征的显著静电可调性证明石墨烯直接将界面磁动力学转换为电信号。我们的工作确立了石墨烯/反铁磁范德华异质结构作为二维磁体中自旋动力学电学读出的多功能平台。
英文摘要
Low-dimensional antiferromagnetic van der Waals materials have emerged as a versatile platform for exploring exotic spin dynamics and magnetic phases, yet electrically accessing these phenomena remains a major challenge because of their vanishing net magnetization and highly insulating nature. Here, we demonstrate that graphene can act as an ultrasensitive electrical transducer of hidden spin dynamics in two-dimensional antiferromagnets. By integrating graphene with the van der Waals antiferromagnet FePS$_3$, low-temperature transport measurements combined with magnetic-field and gate-voltage control reveal multiple resistance anomalies well below the Néel temperature. Their distinct temperature, magnetic-field, and carrier-density dependences enable us to associate these anomalies with magnon excitations and with a low-temperature magnetic reconfiguration of the antiferromagnetic state, both of which remain largely inaccessible to conventional magnetometry. Density functional theory calculations further show that competing antiferromagnetic spin configurations in FePS$_3$ are nearly degenerate in energy while producing markedly different electronic responses in the adjacent graphene layer. The pronounced electrostatic tunability of these signatures demonstrates that graphene directly transduces interfacial magnetic dynamics into an electrical signal. Our work establishes graphene/antiferromagnetic van der Waals heterostructures as a versatile platform for the electrical readout of spin dynamics in two-dimensional magnets.
发表机构
- Universidad Autónoma de Madrid（马德里自治大学）
- Universidad de Sevilla（塞维利亚大学）
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC—Universidad de Zaragoza（阿拉贡纳米科学与材料研究所，西班牙国家研究委员会—萨拉戈萨大学）
- Condensed Matter Physics Center (IFIMAC) and Instituto Universitario de Ciencia de Materiales “Nicolás Cabrera” (INC), Universidad Autónoma de Madrid（凝聚态物理中心及“尼古拉斯·卡布雷拉”材料科学大学研究所，马德里自治大学）
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