N. I. Kourov, V. V. Marchenkov, A. V. Korolev, L. A. Stashkova, S. M. Emelyanova, H. W. Weber, “Specific features of the properties of half-metallic ferromagnetic Heusler alloys Fe$_2$MnAl, Fe$_2$MnSi, and Co$_2$MnAl”, Fizika Tverdogo Tela, 2015, Volume 57, Issue 4,Pages 684

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Magnetism

Specific features of the properties of half-metallic ferromagnetic Heusler alloys Fe$_2$MnAl, Fe$_2$MnSi, and Co$_2$MnAl

N. I. Kourov^a, V. V. Marchenkov^ab, A. V. Korolev^a, L. A. Stashkova^a, S. M. Emelyanova^a, H. W. Weber^c

^a Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
^b International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland
^c Atominstitut, Vienna University of Technology, Vienna, Austria

Abstract: The structural, magnetic, and electrical properties of half-metallic Heusler alloys Fe$_2$MnAl, Fe$_2$MnSi, and Co$_2$MnAl have been investigated in the temperature range of 4–900 K. According to the X-ray diffraction analysis, these alloys have the $B2$ and $L2_1$ structures with different degrees of atomic order. The magnetic state of the alloys is considered as a two-sublattice ferrimagnet. The electrical resistivity and thermoelectric power have been discussed in the framework of the two-current conduction model taking into account the existence of an energy gap in the electronic spectrum of the alloys near the Fermi level for the subband with spin-down (minority) electrons.

Received: 07.10.2014