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arXiv · 1907.02439

Strain-tunable magnetic order and electronic structure in 2D CrAsS$_4$

Tengfei Hu·Wenhui Wan·Yanfeng Ge·Yong Liu
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Abstract

The effect of strain on the magnetic order and band structure of single-layer CrAsS$_4$ has been investigated by first-principles calculations based on density functional theory. We found that single-layer CrAsS$_4$ was an antiferromagnetic (AFM) semiconductor, and would have a phase transition from AFM state to ferromagnetic (FM) state by applying a uniaxial tensile strain of 2.99\% along the y-direction or compressive strain of 1.76\% along the x-direction. The underlying physical mechanism of strain-dependent magnetic stability was further elucidated as the result of the competition between the direct exchange and indirect superexchange interactions. Moreover, band gap exhibit a abrupt change along with phase transition of magnetic order. Our study provides an intuitional approach to design strain-modulated spintronic devices.

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Tengfei Hu, Wenhui Wan, Yanfeng Ge, Yong Liu. 2019-07-04. Strain-tunable magnetic order and electronic structure in 2D CrAsS$_4$. https://doi.org/10.1016/j.jmmm.2019.165941

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