Enhancement of spin polarization via Fermi level tuning in Co2MnSn1−xSbx (x = 0, 0.25. 0.5, 0.75, 1) Heusler alloys

Full potential approach has been employed to tune Fermi level in Co2MnSn1−xSbx (x = 0, 0.25, 0.5, 0.75, 1) Heulser alloys for enhancement of spin polarization and finding signature of half metallicity. Present density functional theory (DFT) based calculation indicates that stoichoimetric Heusler alloy, Co2MnSn is not a half-metallic ferromagnet but the doping of Sb in it results in the shifting of EF in well-defined energy gap which leads the 100% spin polarization in the resultant alloys. The magnetism in present alloys is governed by localized moment on Mn atom mainly. The tuning of half-metallicity using doping can be proved as an ideal technique to search the new materials which can accomplish the need of spintronics