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arXiv 2409.02577cond-mat.mtrl-scicond-mat.mes-hall
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MnSe₂单层和双层中层间耦合可旋转的磁易轴

Interlayer coupling rotatable magnetic easy-axis in MnSe2 mono- and bi-layers

Zhongqin Zhang, Cong Wang, PengJie Guo, Linwei Zhou, Yuhao Pan, Zhixin Hu, Wei Ji

AI总结:

本研究发现层间耦合可显著改变MnSe₂的磁易轴取向,揭示非金属Se轨道的关键作用,并通过多种调控手段验证结论,为自旋电子学应用提供参考。

摘要:

层间耦合在调控二维材料的电子结构和磁基态方面发挥着关键作用,其受层数、层间距和堆叠序的影响。然而,它对磁易轴取向的影响仍未得到充分探究。本研究中,我们证明层间耦合可显著改变磁易轴取向:单层1T-MnSe₂的磁易轴相对z轴倾斜67°,而在双层中则与z轴对齐。这种变化源于费米能级附近轨道占据的变化,尤其涉及非金属Se原子。与传统上聚焦于磁性金属原子的研究不同,我们的发现揭示了Se轨道在影响易轴取向和拓扑陈数(Chern number)方面发挥着关键作用。此外,我们通过改变堆叠序、引入电荷掺杂、施加面内双轴应变以及替换非金属原子验证了结论。我们的研究结果凸显了层间耦合在调控层状材料磁性方面的核心作用,对自旋电子学应用具有重要意义。

英文摘要:

Interlayer coupling plays a critical role in tuning the electronic structures and magnetic ground states of two-dimensional materials, influenced by the number of layers, interlayer distances, and stacking order. However, its effect on the orientation of the magnetic easy axis remains underexplored. In this study, we demonstrate that interlayer coupling can significantly alter the magnetic easy-axis orientation, as shown by the magnetic easy-axis of monolayer 1T-MnSe2 tilting 67° from the z-axis, while aligning with the z-axis in the bilayer. This change results from variations in orbital occupations near the Fermi level, particularly involving nonmetallic Se atoms. Contrary to the traditional focus on magnetic metal atoms, our findings reveal that Se orbitals play a key role in influencing the easy-axis orientation and topological Chern numbers. Furthermore, we validated our conclusions by changing stacking orders, introducing charge doping, applying in-plane biaxial strains, and substituting non-metallic atoms. Our results highlight the pivotal role of interlayer coupling in tuning the magnetic properties of layered materials, with important implications for spintronic applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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