Sulfur-vacancy-tunable interlayer magnetic coupling in centimeter-scale MoS2 bilayer
Sulfur-vacancy-tunable interlayer magnetic coupling in centimeter-scale MoS2 bilayer
复制标题
厘米级MoS2双层中硫空位可调层间磁耦合
DOI：
10.1007/s12274-021-3569-7
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发表时间：
2021-09-10
期刊：
影响因子：
9.9
通讯作者：
Yan, Wensheng
中科院分区：
文献类型：
--
作者：
Duan, Hengli;Li, Guinan;Yan, Wensheng
赋予双层过渡金属二硫化物（TMD）可调磁性对于研究多电子自由度（DOF）的耦合具有重要意义。然而，有效诱导和调节双层 TMD 的磁相互作用仍然是挑战。在此，我们报告了一种通过引入硫空位（VS）来调节层间电子耦合来调整厘米级MoS2双层与Co离子替代掺杂的层间交换相互作用的策略。正如磁性测量所揭示的那样，这种策略可以将层间交换相互作用从反铁磁性（AFM）转变为铁磁性（FM）。实验表征和理论计算表明，磁化强度的增强主要是因为Co 3d带和VS诱导杂质带的杂化改变了上下层部分Co原子之间的层间轨道杂化形式，并且增强了层内FM。我们的工作为调整层间交换与缺陷的相互作用铺平了道路，并且可以扩展到其他二维（2D）磁性材料。
Endowing bilayer transition-metal dichalcogenides (TMDs) with tunable magnetism is significant to investigate the coupling of multiple electron degrees of freedom (DOFs). However, effectively inducing and tuning the magnetic interaction of bilayer TMDs are still challenges. Herein, we report a strategy to tune the interlayer exchange interaction of centimeter-scale MoS2 bilayer with substitutional doping of Co ion, by introducing sulfur vacancy (VS) to modulate the interlayer electronic coupling. This strategy could transform the interlayer exchange interaction from antiferromagnetism (AFM) to ferromagnetism (FM), as revealed by the magnetic measurements. Experimental characterizations and theoretical calculations indicate that the enhanced magnetization is mainly because the hybridization of Co 3d band and VS-induced impurity band alters the forms of interlayer orbital hybridizations between the partial Co atoms in upper and lower layers, and also enhances the intralayer FM. Our work paves the way for tuning the interlayer exchange interaction with defects and could be extended to other two-dimensional (2D) magnetic materials.