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

AuthorsOtrokov, M. M.; Fischer, G.; Buczek, P.; Ernst, A.; Chulkov, Eugene V.
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review B 86: 184418 (2012)
AbstractUsing 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.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.86.184418
Identifiersdoi: 10.1103/PhysRevB.86.184418
issn: 1098-0121
e-issn: 1550-235X
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