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First-Principles Prediction of Electronic, Magnetic, and Optical Properties of Co2MnAs Full-Heusler Half-Metallic Compound

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Abstract

Electronic, magnetic, and optical properties of Co2MnAs full-Heusler compound have been calculated using a first-principles approach with the full-potential linearized augmented plane-wave (FP-LAPW) method and generalized gradient approximation plus U (GGA + U). The results are compared with various properties of Co2MnZ (Z = Si, Ge, Al, Ga, Sn) full-Heusler compounds. The results of our calculations show that Co2MnAs is a half-metallic ferromagnetic compound with 100% spin polarization at the Fermi level. The total magnetic moment and half-metallic gap of Co2MnAs compound are found to be 6.00μ B and 0.43 eV, respectively. It is also predicted that the spin-wave stiffness constant and Curie temperature of Co2MnAs compound are about 3.99 meV nm2 and 1109 K, respectively. The optical results show that the dominant behavior, at energy below 2 eV, is due to interactions of free electrons in the system. Interband optical transitions have been calculated based on the imaginary part of the dielectric function and analysis of critical points in the second energy derivative of the dielectric function. The results show that there is more than one plasmon energy for Co2MnAs compound, with the highest occurring at 25 eV. Also, the refractive index variations and optical reflectivity for radiation at normal incidence are calculated for Co2MnAs. Because of its high magnetic moment, high Curie temperature, and 100% spin polarization at the Fermi level as well as its optical properties, Co2MnAs is a good candidate for use in spintronic components and magnetooptical devices.

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Acknowledgement

This work was supported by the Office of the Vice President for Research at the Department of Physics, Mashhad Branch, Islamic Azad University, Mashhad, Iran.

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Authors and Affiliations

  1. Department of Physics, Mashhad Branch, Islamic Azad University, Mashhad, Iran

    A. Bakhshayeshi &  R. Taghavi Mendi

  2. School of Physics, Damghan University, P.O. Box 36715/364, Damghan, Iran

    M. Majidiyan Sarmazdeh

  3. Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    A. Boochani

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  1. A. Bakhshayeshi
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  2. M. Majidiyan Sarmazdeh
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  3. R. Taghavi Mendi
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Bakhshayeshi, A., Sarmazdeh, M.M., Mendi, .T. et al. First-Principles Prediction of Electronic, Magnetic, and Optical Properties of Co2MnAs Full-Heusler Half-Metallic Compound. J. Electron. Mater. 46, 2196–2204 (2017). https://doi.org/10.1007/s11664-016-5158-1

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  • DOI: https://doi.org/10.1007/s11664-016-5158-1

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