Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations

Krzysztof Zberecki; Leszek Adamowicz; Michał Wierzbicki

Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations

Materials Science 2008-09-14 v2

Authors: Krzysztof Zberecki , Leszek Adamowicz , Michał Wierzbicki

Abstract

The first-principles full-potential linearized augmented plane-wave method based on density functional theory is used to investigate electronic structure and magnetic properties of hypothetical binary compounds of I $^{A}$ subgroup elements with nitrogen (LiN, NaN, KN and RbN) in assumed three types of cristalline structure (rock salt, wurtzite and zinc-blende). We find that, due to the spin polarized \textit{p} orbitas of N, all four compounds are half-metallic ferromagnets with wide energy bandgaps (up to 2.0 eV). The calculated total magnetic moment in all investigated compounds for all three types of crystal structure is exactly 2.00 $\mu_{\text{B}}$ per formula unit. The predicted half-metallicity is robust with respect to lattice-constant contraction. In all the cases ferromagnetic phase is energetically favored with respect to the paramagnetic one. The mechanism leading to half-metallic ferromagnetism and synthesis possibilities are discussed.

Keywords

half-metallic ferromagnetism alkali metal nitrides ab initio calculations density functional theory spin polarization electronic structure magnetic moment

Cite

@article{arxiv.0808.1951,
  title  = {Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations},
  author = {Krzysztof Zberecki and Leszek Adamowicz and Michał Wierzbicki},
  journal= {arXiv preprint arXiv:0808.1951},
  year   = {2008}
}

Comments

11 pages, 6 figures, submitted to Phys. Rev. B

Half-metallic ferromagnetism in binary compounds of alkali metals with nitrogen: Ab initio calculations

Abstract

Keywords

Cite

Comments

Related papers