单层FePS$_3$中金诱导的界面 emergent 磁性
Emergent gold-induced interfacial magnetism in monolayer FePS$_3$
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中文总结 AI 辅助
研究发现二维反铁磁体FePS$_3$与超薄金膜形成的异质结中，金诱导出显著界面磁性，源于界面电荷转移和Fe 3d-Au杂化，该效应随层数增加衰减，为原子级调控磁性提供了新手段。
中文摘要 AI 辅助
由于二维（2D）材料具有原子级清洁的界面和极薄的厚度，是强邻近效应的理想载体，邻近效应指与相邻材料接触会改变其基态。本文在二维反铁磁体FePS$_3$与超薄金膜构成的混合异质结中展示了该效应。金膜并非惰性衬底，而是深刻改变了二维磁体的磁性本质，诱导出显著的界面磁矩。通过金辅助剥离法制备的大面积薄片，结合元素选择性X射线吸收 mapping，实现了从单层到块体的逐层研究，并以惰性SiO$_2$衬底作为参考基准。在9 T、5 K条件下，金上的单层FePS$_3$的X射线磁圆二色性较SiO$_2$上的样品增强了3倍，轨道自旋磁矩比降低约40%。共振非弹性X射线散射揭示了晶体场（d-d）激发的崩溃以及大量谱重向电荷转移区域的转移，阐明了该变化的微观机制。原子多极计算表明，界面电荷转移和Fe 3d-Au杂化是这些效应的起源，这些效应在前三层内衰减，至五层时消失，确立了层数结合衬底工程是一种原子级精确的调控手段。
英文摘要
Owing to their atomically clean interfaces and extreme thinness, two-dimensional (2D) materials are ideal hosts for strong proximity effects, whereby contact with an adjacent material reshapes their ground state. Here, we demonstrate such an effect within a hybrid heterostructure, between the 2D antiferromagnet FePS$_3$ and an ultrathin gold film. Rather than a passive support, the latter profoundly changes the nature of the magnetism in the 2D magnet, inducing a sizeable interfacial moment. Large-area flakes from Au-assisted exfoliation, combined with element-selective X-ray absorption mapping, enable a layer-by-layer study from monolayer to bulk, benchmarked against an inert SiO$_2$ substrate reference. At 9 T and 5 K, the monolayer on gold shows a three-fold enhanced X-ray magnetic circular dichroism relative to SiO$_2$, with a $\sim$40% reduction of the orbital-to-spin moment ratio. Resonant inelastic X-ray scattering reveals a collapse of the crystal-field (d-d) excitations and a massive spectral-weight transfer to the charge-transfer region, unveiling the microscopic mechanism behind this change. Supported by atomic multiplet calculations, we identify interfacial charge transfer and Fe 3d-Au hybridization as the origin of these effects, which decay over the first three layers and vanish at the pentalayer, establishing layer number combined with substrate engineering as an atomically precise handle.
发表机构
- European Synchrotron Radiation Facility（欧洲同步辐射装置）
- Université Grenoble Alpes, CNRS, Grenoble INP, Institut NEEL（格勒诺布尔阿尔卑斯大学、法国国家科学研究中心、格勒诺布尔理工学院、NEEL研究所）
- Department of Physics Giuseppe Occhialini, University of Milano-Bicocca（米兰比可卡大学朱塞佩·奥基亚利尼物理系）
- Université Grenoble Alpes, CEA, IRIG, MEM（格勒诺布尔阿尔卑斯大学、法国原子能和替代能源委员会、研究与信息技术部、材料与物理化学实验室）
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