Ab initio study of electronic structure and magnetic properties in ferromagnetic Be1−xMnxSe and Be1−xMnxTe alloys

► A spin effect theoretical study on Mn-doped BeSe and BeTe has been performed. ► First principles FP-LAPW+lo approach based on DFT is used for this purpose. ► Spin-polarized band structure of these semiconductor alloys has been calculated. ► Ferromagnetic and/or half-metallic character of these alloys is determined. ► Values of exchange constants and magnetic moments are estimated.