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The Effect of Gd Impurities on the Physical Properties of Half-Metallic Ferromagnet Co_2MnSi

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Grasin R., Vinteler E., Bezergheanu A., Rusu C., Pacurariu R., Deac I., Tetean R.

issue 4

648-651

In this paper we report our experimental and theoretical studies on the effect of Gd impurity on the physical properties of the Heusler half-metallic ferromagnet Co_2MnSi. The analysis of the band structures of the doped alloy shows that the half-metallic properties are completely conserved if Gd substitutes Mn atoms. This effect is not determined by the spin-orbit interaction, but through the coupling between the R(4f) spin with the Mn(3d) itinerant electron spins. We evaluate the strength of such a coupling by calculating, in an ab initio fashion, the total energy of Co_{16}GdMn_7Si_8 compound for a parallel and antiparallel f-d coupling. The obtained magnetic moments of Co or Mn sites are in good agreement with the experimental ones.

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1 Acta Physica Polonica A

1 2010

1 Bezergheanu A.

1 Deac I.

1 Grasin R.

1 Pacurariu R.

1 Rusu C.

1 Tetean R.

1 Vinteler E.

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The Effect of Gd Impurities on the Physical Properties of Half-Metallic Ferromagnet Co_2MnSi