arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.10520cond-mat.mtrl-scicond-mat.mes-hall
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单层CrI $_3$中自旋-自旋相互作用的应变和电场控制

Strain and electric-field control of spin-spin interactions in monolayer CrI$_3$

Sahar Izadi Vishkayi, Zahra Torbatian, Alireza Qaiumzadeh, Reza Asgari

摘要:

利用密度泛函理论研究了机械应变和垂直电场对二维单层CrI $_3$的电子和磁性基态性质的影响.我们提出了一个最小的自旋模型哈密顿量,包括对称各向同性交换相互作用,磁各向异性能,和Dzyaloshinskiii-Moriya(DM)的相互作用,以捕捉最相关的磁系统的属性。我们计算了各种自旋-自旋相互作用对机械应变和电场的依赖性。我们的研究结果表明,交换相互作用的幅度和符号都可以通过应变来设计,而电场只影响它们的幅度。然而,应变和电场影响DM矢量的方向和幅度。磁各向异性能的幅度也可以通过施加的应变而被显著地修改。我们表明,在比较电场,应变可以更有效地用于操纵系统的磁性和电子性质。值得注意的是,这种系统的自旋相互作用的调整是必不可少的工程室温自旋电子纳米器件。

英文摘要:

We investigate the impact of mechanical strains and a perpendicular electric field on the electronic and magnetic ground-state properties of two-dimensional monolayer CrI$_3$ using density functional theory. We propose a minimal spin model Hamiltonian, consisting of symmetric isotropic exchange interactions, magnetic anisotropy energy, and Dzyaloshinskii-Moriya (DM) interactions, to capture most pertinent magnetic properties of the system. We compute the mechanical strain and electric field dependence of various spin-spin interactions. Our results show that both the amplitudes and signs of the exchange interactions can be engineered by means of strain, while the electric field affects only their amplitudes. However, strain and electric fields affect both the directions and amplitudes of the DM vectors. The amplitude of the magnetic anisotropy energy can also be substantially modified by an applied strain. We show that in comparison with an electric field, strain can be more efficiently used to manipulate the magnetic and electronic properties of the system. Notably, such systematic tuning of the spin interactions is essential for the engineering of room-temperature spintronic nanodevices.

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