First principles study of half-metallic ferromagnetism in Zn1−xEuxS

► The electronic properties of Zn1−xEuxS have been calculated using the FPLAW method. ► The DFT is applied using GGA and GGA+U to understand who is responsible for magnetism. ► After the Eu incorporation, a new localized band appears between the VB and the CB. ► Using the correction GGA+U the Zn1−xEuxS it becomes half-metallic ferromagnetic SC. ► The GGA+U are very important for the 4f orbit of the Eu atom in Zn1−xEuxS.