Two-dimensional stable Mn based half metal and antiferromagnets promising for spintronics
In this paper, we predict that the tetragonal MnSi and MnC0.50.5Si0.5 monolayers are mechanical stable metallic ferromagnetic materials. The thermal stability of MnC0.5Si0.5 monolayer is verified by our Ab initio molecular dynamics (AIMD) result of 300 K. Both of MnSi and MnC0.5Si0.5 monolayer exhibit room temperature half-metallic property, which is very promising for spintronic application. For the both monolayers, they exhibit large perpendicular magnetic anisotropy, which is desirable for the maintain of magnetic order and high density storage spintronics. As to the MnSi nanosheet, bilayer could obviously enhance its thermal stability and it exhibits antiferromagnetic metal property. The Néel temperature could be effectively manipulation and improved by surface functionalization. In addition, for the monolayer and bilayer MnSi nanosheet, they exhibit nodal line in the reciprocal space, and the nodal lines are robust against the spin orbit coupling.