Magnetic properties of a Na-doped WS2 monolayer in the presence of an isotropic strain

Abstract

The magnetic properties of Na-doped WS₂ monolayer under strain are investigated by ab initio methods. Without strain, the Na-doped WS2 monolayer is a magnetic nanomaterial and the total magnetic moment is about 1.07μ_B. We applied strain to Na-doped WS₂ monolayer from–10% to 10%. The magnetic properties are modified under different strain; the doped system gets a maximum value of at 2.01μ_B 10% tensile strain and a minimum value of at 0μ_B–10% compressive strain. The coupling between 3p states of S and 5d states of W is responsible for the strong strain effect on the magnetic properties. Our studies predict Na-doped WS₂ monolayer under strain to be candidates for application in spintronics.