Magnetic Anisotropy of Cr2Te3: Competition between Surface and Middle Layers

IF 1.5 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER Physica Status Solidi B-basic Solid State Physics Pub Date : 2024-09-15 DOI:10.1002/pssb.202400308

Yile Wang, Shilei Ji, Jianping Yang, Xing'ao Li

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Abstract

Recently, the orbital coupling in 2D materials has been demonstrated to have a significant impact on the magnetic anisotropy (MA) of CrTe2. The Te atomic layers on the surface layers determine the magnetocrystalline anisotropy (MCA) of the system due to orbital coupling. Herein, is proposed to investigate the surface and middle layers of Te atoms on MA. The MCA of consists of in‐plane and out‐of‐plane components, which are contributed by the surface layer and middle layer, respectively. Due to the lack of Cr–Te–Cr chemical bonds in the z‐axis, the surface layer produces coupling and results in the in‐plane MA. In addition, a tensile strain can enhance the coupling on the middle layer and lead to the out‐of‐plane MCA. At the same time, the out‐of‐plane MCA breaks the vertical mirror symmetry and an anomalous Hall effect has been detected on monolayer (1L) . Based on this result, an anomalous Hall device is designed to record and read information. The opposing contribution of the surface and middle layers provides a completely new way to understand 2D materials.

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Cr2Te3 的磁各向异性：表层和中层之间的竞争

最近的研究证明，二维材料中的轨道耦合对 CrTe2 的磁各向异性（MA）有重大影响。由于轨道耦合，表层的 Te 原子层决定了体系的磁晶各向异性（MCA）。本文拟研究 MA 上 Te 原子的表层和中间层。磁晶各向异性包括面内和面外成分，分别由表层和中间层贡献。由于在 Z 轴上缺乏 Cr-Te-Cr 化学键，表层产生耦合并导致面内 MA。此外，拉伸应变会增强中间层的耦合，导致面外 MCA。同时，面外 MCA 打破了垂直镜面对称性，并在单层 (1L) 上检测到了异常霍尔效应。基于这一结果，我们设计了一种反常霍尔器件来记录和读取信息。表层和中间层的对立贡献为理解二维材料提供了一种全新的方法。

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来源期刊

Physica Status Solidi B-basic Solid State Physics 物理-物理：凝聚态物理

CiteScore

3.30

自引率

6.20%

发文量

321

审稿时长

2 months

期刊介绍： physica status solidi is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Being among the largest and most important international publications, the pss journals publish review articles, letters and original work as well as special issues and conference contributions. physica status solidi b – basic solid state physics is devoted to topics such as theoretical and experimental investigations of the atomistic and electronic structure of solids in general, phase transitions, electronic and optical properties of low-dimensional, nano-scale, strongly correlated, or disordered systems, superconductivity, magnetism, ferroelectricity etc.