Search for stable ferromagnets among AIV/Fe digital alloys (AIV= Si, Ge) using first-principles calculations

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Verlag/Körperschaft:
American Physical Society
Erscheinungsjahr:
2012
Medientyp:
Text
Schlagworte:
  • 530: Physik
  • ddc:530
Beschreibung:
  • Using first-principles electronic structure calculations we investigate the existence of stable ferromagnets among the AIV/Fe digital alloys (AIV=Si,Ge), modeled as periodic sequence of Fe monolayers in the AIV host. Total-energy calculations and the magnetic force theorem are exploited for accurate determination of the magnetic ordering. To estimate the critical temperatures, Monte Carlo simulations are employed, while the renormalization-group analytical expressions are applied to assess the impact of the interlayer exchange on the critical temperature values. According to our results, among the systems under consideration only the Ge-based alloys feature a stable ferromagnetic ordering at nonzero temperature. The critical temperatures of these systems were found to be strongly dependent on the underlying crystal structure. © 2012 American Physical Society.
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ReposIt
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oai:reposit.haw-hamburg.de:20.500.12738/10865