自旋电子学
居里温度
凝聚态物理
超级交换
价(化学)
铁磁性
物理
磁性半导体
磁各向异性
自旋(空气动力学)
材料科学
磁矩
原子轨道
结晶学
磁化
热力学
量子力学
化学
磁场
电子
作者
Jinsen Zhang,Yao Wang,Chenqiang Hua,Shenbo Yang,Yujing Liu,Jianmin Luo,Tiefeng Liu,Jianwei Nai,Xinyong Tao
出处
期刊:Physical review
日期:2022-12-02
卷期号:106 (23)
被引量:9
标识
DOI:10.1103/physrevb.106.235401
摘要
Recent studies have demonstrated that two-dimensional intrinsic magnetic materials with high Curie temperature $({T}_{\text{c}})$ and large magnetic anisotropy energy (MAE) are highly desirable for future spintronics. After careful investigations through density functional theory, bipolar ${\mathrm{VSi}}_{2}{\mathrm{As}}_{4}$ and ${\mathrm{VGe}}_{2}{\mathrm{As}}_{4}$ monolayers, with semiconductor valence and conduction band edges fully spin polarized in different spin directions, are demonstrated to be highly stable and have in-plane ferromagnetism (FM) with large MAE of $\ensuremath{\sim}5.5$ meV. The FM interaction is found to be dominated by the superexchange between d orbitals of V atoms through p orbitals of anions. More interestingly, ${T}_{\text{c}}$ is estimated to be $\ensuremath{\sim}900$ K through Monte Carlo simulation, which is significantly higher than room temperature. In addition, both MAE and ${T}_{\text{c}}$ can be substantially regulated and increased under biaxial strain and the transition from FM semiconductors to metals will occur. Our calculations and analyses indicate that ${\mathrm{VSi}}_{2}{\mathrm{As}}_{4}$ and ${\mathrm{VGe}}_{2}{\mathrm{As}}_{4}$ monolayers are ideal systems for the fundamental understanding of magnetic physics as well as building blocks for magnetoelastic applications, high-temperature, or/and gate-tunable spintronic nanodevices.
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