Theoretical Search of Spintronic Material in Fe₂(Cr_1−xMn_x)Si and (Fe_1−xCo_x)₂MnSi

Abstract

Materials suitable for spintronic devices are searched in two systems Fe₂(Cr_1−xMn_x)Si and (Fe_1−xCo_x)₂MnSi. The desired characteristics are: high spin polarization, stability of ferromagnetism and high Curie temperature. The first is investigated by considering the density of states and the velocity at the Fermi energy. The second is investigated by comparing the total energies of the paramagnetic, ferromagnetic and antiferromagnetic states. Partial substitution of the Co atoms for the Fe atoms in Fe₂MnSi is effective in stabilizing the ferromagnetic state. There may be spintronic materials with the high Curie temperature in (Fe_1−xCo_x)₂MnSi.