Effect of site preference of 3d atoms on the electronic structure and half-metallicity of Heusler alloy Mn 2 YAl

Hongzhi Luo*, Zhiyong Zhu, Li Ma, Shifeng Xu, Xiaoxi Zhu, Chengbao Jiang, Huibin Xu, Guangheng Wu

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    77 Scopus citations

    Abstract

    The site preference of 3d atoms Y in Mn 2 YAl (Y = V, Fe, Co) alloys and its influence on their electronic structures and magnetism have been studied by first-principles calculations. The results prove that elements with more valence electrons than Mn tend to enter the A (0, 0, 0) and C (, , ) sites and elements with fewer electrons prefer the B (, , ) site (Wyckoff positions). Meanwhile, it is found that for Mn 2 VAl and Mn 2 FeAl, a high spin polarization can be obtained whether the Y atom enters the (A, C) or the B site. In particular, Mn 2 VAl is half-metallic whether it forms the Cu 2 MnAl type or the Hg 2 CuTi type of structure. And a 100% spin polarization can be retained even when a 25% Mn-V antisite disorder occurs. This is quite preferable in practical applications. It is also found that the higher-valent element such as Co at the B (, , ) site has opposite effects and tends to close the energy gap. Finally, a systemic summarization on the electronic and magnetic properties of Mn 2 YAl (Y = Ti, V, Cr, Mn, Fe and Co) alloys was made. All of them except for Mn 2 TiAl are predicted as half-metals. The calculated total spin moment is an integral value and increases from -3ν B /f.u. for Mn 2 TiAl to +2ν B /f.u. for Mn 2 CoAl with increasing number of valence electrons. This agrees with the Slater-Pauling curve quite well. All the Mn 2 YAl alloys studied here are ferrimagnets.

    Original languageEnglish (US)
    Article number055010
    JournalJournal of Physics D: Applied Physics
    Volume41
    Issue number5
    DOIs
    StatePublished - Mar 7 2008

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Acoustics and Ultrasonics
    • Surfaces, Coatings and Films

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