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First-Principles Study of Half-Metallic and Magnetic Properties for the Heusler Alloys Fe2CrX (X = P, As, Sb, Bi)

  • B. S. ChenEmail author
  • Y. Z. Li
  • X. Y. Guan
  • C. Wang
  • C. X. Wang
  • Z. Y. Gao
Original Paper

Abstract

The electronic structure and magnetism of the Heusler alloys Fe2CrX (X = P, As, Sb, Bi) have been investigated by first-principles calculations based on density functional theory. The calculations show that all Fe2CrX alloys are half-metals with a magnetic moment of 3.00 μ B at their respective equilibrium lattice constants, which is in good agreement with the Slater–Pauling rule. The origin of energy gap in the minority-spin states is discussed in terms of the hybridization among the 3d electrons of the Fe and Cr atoms. The total magnetic moments for these alloys are mainly determined by the partial moment of Cr atom. The change of Fe and Cr moments compensates each other and keeps the total magnetic moment as an integer when the X atom changes By investigating the effects of lattice constants on half-metallic and magnetic properties of Fe2CrX alloys, it is found that half-metallic properties of Fe2CrSb and Fe2CrBi alloys are the most insensitive to the lattice distortion and a 100 % spin polarization can be obtained when the lattice is expanded from −9 % to + 3 %.

Keywords

Heusler alloy Half-metal Magnetic property First principles 

Notes

Acknowledgments

This work was supported by the Fundamental Research Funds for the Central Universities (Grant No 2572014CB31), Heilongjiang Provincial Youth Science Foundation (Grant No. QC2013C006) and the National Natural Science Foundation of China (Grant Nos. 11374353 and 11404055).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • B. S. Chen
    • 1
    Email author
  • Y. Z. Li
    • 2
  • X. Y. Guan
    • 1
  • C. Wang
    • 1
  • C. X. Wang
    • 1
  • Z. Y. Gao
    • 3
  1. 1.College of Science Heilongjiang Bayi Agricultural UniversityDaqingChina
  2. 2.College of Science Northeast Forestry UniversityHarbinChina
  3. 3.School of Materials Science and Engineering Harbin Institute of TechnologyHarbinChina

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