Theoretical search of spintronic material in Fe2(Cr[1-x]Mn[x])Si and (Fe[1-x]Co[x])2MnSi

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  • Ishida Shoji
    Department of Physics, Faculty of Science, Kagoshima University
  • Nagatomo Daisuke
    The Graduate School of Science and Engineering, Kagoshima University
  • Fujii Sinpei
    Department of Physics, Faculty of Science, Kagoshima University
  • Asano Setsuro
    Institute of Physics, College of Arts and Sciences, The University of Tokyo

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  • Theoretical Search of Spintronic Material in Fe<SUB>2</SUB>(Cr<SUB>1−<I>x</I></SUB>Mn<I><SUB>x</SUB></I>)Si and (Fe<SUB>1−<I>x</I></SUB>Co<I><SUB>x</SUB></I>)<SUB>2</SUB>MnSi
  • Theoretical Search of Spintronic Material in Fe<SUB>2</SUB>(Cr<SUB>1&minus;<I>x</I></SUB>Mn<I><SUB>x</SUB></I>)Si and (Fe<SUB>1&minus;<I>x</I></SUB>Co<I><SUB>x</SUB></I>)<SUB>2</SUB>MnSi

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Materials suitable for spintronic devices are searched in two systems Fe2(Cr1−xMnx)Si and (Fe1−xCox)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 (Fe1−xCox)2MnSi.

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