SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Mirbt Susanne) srt2:(2000-2004)"

Sökning: WFRF:(Mirbt Susanne) > (2000-2004)

  • Resultat 1-10 av 13
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  •  
2.
  • Bergqvist, Lars, 1976-, et al. (författare)
  • Magnetic and electronic structure of (Ga1-xMnx)As
  • 2003
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 67:20, s. 205201-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present theoretical calculations of the magnetic and electronic structure of Mn-doped GaAs (in the zinc-blende structure). The magnetic properties are shown to be very sensitive to structural defects, in particular, As antisite defects and Mn at interstitial positions. Only when considering such defects can the experimental magnetic moments be reproduced by first-principles theory. We present a simple model for understanding the connection between the magnetic ordering and the As antisites, and the way in which the defects help to stabilize a partial disordered local-moment state. The connection between the energetics of the Mn substitution and the As antisite concentration is also analyzed. In addition, we compare the calculated magnetic properties and electronic structures of Mn situated on substitutional sites (Mn replacing a Ga atom) and on interstitial sites, where in agreement with observations the interstitial site is found to be less favorable. Finally, combining our first-principles calculations of the spin-wave excitation energies with a classical Heisenberg Hamiltonian we have calculated interatomic exchange interactions, and using Monte Carlo simulations we present theoretical values of the critical temperature as a function of Mn concentration.
  •  
3.
  •  
4.
  •  
5.
  •  
6.
  •  
7.
  • Mirbt, Susanne, et al. (författare)
  • First-principles calculations of Fe on GaAs(100)
  • 2003
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 67, s. 155421-
  • Tidskriftsartikel (refereegranskat)
  •  
8.
  • Mirbt, Susanne, et al. (författare)
  • Magnetic properties of 3d-impurities substituted in GaAs
  • 2002
  • Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 14:12, s. 3295-
  • Tidskriftsartikel (refereegranskat)abstract
    • We have calculated the magnetic properties of substituted 3d impurities (Cr-Ni) in a GaAs host by means of first-principles electronic structure calculations. We provide a novel model explaining the ferromagnetic long-range order of III-V dilute magnetic semiconductors. The origin of the ferromagnetism is shown to be delocalized spin-uncompensated As dangling-bond electrons. Besides the quantitative prediction of the magnetic moments, our model provides an understanding of the half-metallicity, and the rise of the critical temperature with the impurity concentration.
  •  
9.
  •  
10.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 13

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy