Charge-induced ferromagnetism in two-carbon cluster silicon

This paper presents the first-principles study of two carbon clusters in silicon matrix with 64-atom supercell. The band structure and net spin density of states indicate that the system with neutral charge is non-magnetic, but ferromagnetic as the system is charging with one electron or one hole. This phenomenon can be applied to design and fabricate Si-base spintronic MOS, non-volatile magnetic memory and other Si base spintronic devices where the field-controllable ferromagnetism is important.