  Mechanical control of electronic and magnetic properties of 2D Van-der-Waals
heterostructures gives new possibilities for further development of spintronics
and information-related technologies. Using the density functional theory, we
investigate the structural, electronic, and magnetic properties of silicene
monolayer with substituted Chromium atoms and under a small biaxial strain
($-6\%< \epsilon < 8\%$). Our results indicate that the Cr-doped silicene
nanosheets without strain have magnetic metallic, half-metallic or
semiconducting properties depending on the type of substitution. We also show
that the magnetic moments associated with the monomer and vertical dimer
substitutions change very weakly with strain. However, the magnetic moment
associated with the horizontal dimer substitution decreases when either
compressive or tensile strain is applied to the system. Additionally, we show
that the largest semiconductor band-gap is approximately 0.13 eV under zero
strain for the vertical Cr-doped silicene. Finally, biaxial compressive strain
leads to irregular changes in the magnetic moment for Cr vertical dimer
substitution.
