MXenes公司
磁性
堆积
磁矩
凝聚态物理
单层
双层
材料科学
磁各向异性
基态
密度泛函理论
磁性结构
化学
纳米技术
核磁共振
磁场
计算化学
磁化
物理
原子物理学
生物化学
量子力学
膜
作者
Himangshu Sekhar Sarmah,Subhradip Ghosh
标识
DOI:10.1088/1361-6463/accf24
摘要
Abstract Magnetic MXenes are becoming an important family of materials for exploring 2D magnetism. However, investigations into the interdependence of layer thickness, stacking patterns and magnetism in these materials, from a microscopic point of view, are still lacking. In this work, we have used density functional theory based calculations to understand the effects of layer thickness and stacking on the magnetic properties in two magnetic MXenes, Ti 2 C and Fe 2 C, in their monolayer and bilayer forms. The ground-state magnetic structures, magnetic moments, magnetic exchange interactions, magnetic transition temperatures and magnetic anisotropy energies are calculated and analysed using their electronic structures and standardised models. We find that in both systems an increase in layer thickness (monolayer to bilayer) affects the ground-state magnetic configuration, which is driven by the changes in the magnetic exchange interactions. While the effects of the stacking pattern are rather weak in Ti 2 C, they are substantial, both qualitatively and quantitatively, in Fe 2 C. The computed results are analysed from their electronic structures. The results suggest that fascinating physical effects can be obtained in Fe 2 C by tuning the layer thickness and stacking patterns, making it more suitable for device applications.
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