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Strain dependent magentic properties of two dimensional 1T-VSe₂
Jicheol Son,Brahim Marfoua,Jisang Hong 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
We investigated the biaxial strain dependent magnetic properties of two dimensional (2D) VSe₂ single layer using the density functional theory. The ferromagnetic state of the pristine VSe₂ monolayer was preserved under the applied strain. Also, the pristine VSe₂ monolayer had an in-lane magnetic anisotropy of -0.47 meV/cell. The in-plane anisotropy was maintained in both tensile and compressive strain. However, the magnitude of magnetic anisotropy was dependent on the strain type. For instance, the in-plane magnetic anisotropy decreased under compressive strain whereas the opposite behavior appeared under tensile strain. We also explored the strain dependent Curie temperature. The pristine structure had a Curie temperature (TC) of ~ 237K. By applying strains, the exchange energy was enhanced and subsequently, the TC was increased as well. Particularly, we found that the TC increased to 323 K under the tensile strain of 3%. Our finding illustrates the role of the strain in achieving tunable magnetic properties for potential spintronics and straintronics applications in the 2D 1T-VSe₂.
Strain dependent magnetic properties of 1T-VSe2 monolayer
Son Jicheol,MARFOUA BRAHIM,Hong Jisang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.2
Using the frst principles calculations, we investigated the strain dependent magnetic properties of the 1T-VSe2 monolayer (up to±3%). We obtained a metallic band structure, and this feature was preserved under both compressive and tensile strain. The pristine system had a magnetic moment of 0.9 μB/unit cell and decreased to 0.68 μB /unit cell under − 3% compressive strain whereas it was increased to 1.03 μB/unit cell under+3% tensile strain. The 1T-VSe2 monolayer had an in-plane magnetic anisotropy with a value of − 0.48 meV/cell. The in-plane anisotropy features were maintained in both compressive and tensile strains. The orbital resolved magnetic anisotropy indicated that the V atom contributed to the perpendicular magnetic anisotropy while the Se atom had an in-plane anisotropy. We found that the Se dominated the anisotropy. We also calculated the temperature dependent Curie temperature (TC). The pristine structure had a TC of 260 K, and the strain efect enhanced the TC. Particularly, the compressive strain afected further the exchange parameter resulting in substantial enhancement of the Curie temperature where a TC of 570 K was achieved at − 3% strain. Our fnding regarding the strained VSe2 could help for further investigation in spintronics and straintronics applications.