Stability of Half-Metallic Ferromagnetism of Zinc-Blende Type CrAs and MnM (M = Si, Ge and Sn)

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21 Citations (Scopus)

Abstract

By the first-principles calculations both for electronic structures and effective exchange constants, we investigate the stability of ferromagnetism of zinc-blende (ZB) type CrAs, and further examine a possibility of ferromagnetism of ZB type MnM (M = Si, Ge and Sn). ZB type CrAs, a half-metallic ferromagnet reported by Akinaga's group [Jpn. J. Appl. Phys. 39 (2000) L1118], is found to have an effective exchange constant (J0 = ∑i≠0 Ji0) larger than 150meV above the lattice constant of GaAs (a = 5.65 Å), showing quite stable ferromagnetism above room temperature as was observed experimentally. We predict that ZB type MnM (M = Ge, Si, Sn) whose valence electron numbers are the same as that of CrAs also exhibit half-metallic ferromagnetism having a positive J0 large enough at a = 5.82 Å, indicating that the Curie temperatures are higher at least than room temperature.

Original languageEnglish
Pages (from-to)2534-2538
Number of pages5
Journaljournal of the physical society of japan
Volume71
Issue number10
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Keywords

  • CrAs
  • Curie temperature
  • Exchange constants
  • First principles calculation
  • LMTO
  • Magnetic semiconductors
  • MnGe
  • MnSi
  • MnSn
  • Zinc-blende structure

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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