CrI3 monolayer: magnetic and electronic behaviors under biaxial strain and external electric field—a first principle study

A. L. Safi and Md. A. Ahmed ()
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A. L. Safi: Surendranath Evening College
Md. A. Ahmed: Sambhunath College

The European Physical Journal B: Condensed Matter and Complex Systems, 2022, vol. 95, issue 3, 1-8

Abstract: Abstract We have studied the magnetic and electronic behaviors of CrI3 monolayer under biaxial strain and external electric field using first principle calculation. A magnetic phase transition from ferromagnetic to antiferromagnetic state has been observed under a compressing strain of − 6%. The observed influence of biaxial strain on magnetic anisotropy energy is also surprising. Under zero strain it is as high as 0.74 meV/Cr and increases rapidly with compressing strain reaching a value of 1.53 meV/Cr under a compressing strain of − 6%. Moreover, we observe a switching of magnetic easy axis from off-plane to in-plane direction under a tensile strain of 9%. In addition, the bandgap for spin-up ( $${E}_{\mathrm{g}}^{\mathrm{up}})$$ E g up ) from − 10% compressing strain to 10% tensile strain at first increases slowly and exhibits a maximum (~ 0.60 eV) for zero strain. Then it gradually reduces to ~ 0.42 eV for 10% tensile strain. However, the bandgap for spin-down ( $${E}_{\mathrm{g}}^{\mathrm{down}})$$ E g down ) increases monotonically within the entire range and reaches maximum (~ 2.02 eV) for 10% tensile strain. On the other hand, external electric field applied along the off-plane direction (i.e., along c direction) induces significant variations in electronic as well as magnetic (especially MAE) behaviors of CrI3 monolayer. Graphical abstract

Date: 2022
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DOI: 10.1140/epjb/s10051-022-00314-z

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