First-principles study of the Gilbert damping constants of Heusler alloys based on the torque correlation model

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Abstract

On the basis of the torque correlation model for the Gilbert damping constant α, we perform the first principles calculation for α for Co-based Heusler alloys, Co2MnAl (CMA), Co2MnSi (CMS), and Co2FeSi (CFS). In the ordered (L21) and partially disordered (B2) structures, the calculated values of α reflect half-metallicity or the gap structure around the Fermi level, EF, i.e. CMS with 100% spin-polarization has the smallest value. The valence electron number dependence of α follows the experimental trend. However, the calculated values are almost a factor of ten smaller than the measured ones. Although the α values are larger in the completely disordered (A2) structure, they are not as large as the experimental results. Therefore, the decreasing degree of order or the breakdown of the half-metallicity is not responsible for the discrepancy.

Original languageEnglish
Article number164011
JournalJournal of Physics D: Applied Physics
Volume48
Issue number16
DOIs
Publication statusPublished - 2015 Apr 29

Keywords

  • CPA
  • Co<inf>2</inf>FeSi
  • Co<inf>2</inf>MnAl
  • Co<inf>2</inf>MnSi
  • Gilbert damping constant
  • Heusler alloys
  • TB-LMTO
  • first-principles calculations
  • half-metals
  • spin relaxation
  • spintronics

ASJC Scopus subject areas

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

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