Competing magnetic phases of Mn5Ge3 compound (Articolo in rivista)

Type
Label
  • Competing magnetic phases of Mn5Ge3 compound (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Stroppa, A; Peressi, M (2007)
    Competing magnetic phases of Mn5Ge3 compound
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Stroppa, A; Peressi, M (literal)
Pagina inizio
  • 44 (literal)
Pagina fine
  • 52 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 204 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Trieste, Dipartmento Fis Teor, I-34014 Trieste, Italy; INFM DEMOCRITOS, Natl Simulat Ctr, Trieste, Italy (literal)
Titolo
  • Competing magnetic phases of Mn5Ge3 compound (literal)
Abstract
  • Germanium-based compounds have recently attracted considerable attention in Semiconductor Spintronics. The Mn5Ge3 compound have been grown on Ge(111) substrate so that epitaxial 'spin valves' can be fabricated. Recent experiments suggest a spin structure that is likely non-collinear. In order to gain deep insights into the magnetic structure of this compound, we have performed fully unconstrained ab-initio pseudo-potential calculations within spin density functional theory. We have considered several possible magnetic configurations: paramagnetic (PM), collinear (C) ferromagnetic (FM) and anti-ferromagnetic (AFM), non-collinear (NC) spin configurations. We first study the effect of the pressure. At equilibrium volume (V-eq = 0.203 nm(3)), the C-FM and NC self-consistent solutions (which have different magnetic states) are competing phases. For V similar or equal to 1.1 V-eq there is a crossover of the C-FM and C-ATM curves, with the C-AFM becoming favourite with respect to C-FM for larger volumes. Finally, we have studied the effect of strain field. Interestingly, the degeneracy of the NC phase with the C-spin configurations (FM and AFM) is definitely removed under the effect of uniaxial structural distortions (NC spin configuration is favoured under tensile uniaxial strain). (literal)
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