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Título

Iron silicide formation at different layers of (Fe/Si)3 multilayered structures determined by conversion electron Mössbauer spectroscopy

AutorBadía-Romano, L.; Rubín, Javier; Magen, Cesar; Bürgler, D. E.; Bartolomé, Juan
Fecha de publicación2014
EditorAmerican Institute of Physics
CitaciónJournal of Applied Physics 116(2): 023907 (2014)
ResumenThe morphology and the quantitative composition of the Fe-Si interface layer forming at each Fe layer of a (Fe/Si)3 multilayer have been determined by means of conversion electron Mössbauer spectroscopy (CEMS) and high-resolution transmission electron microscopy (HRTEM). For the CEMS measurements, each layer was selected by depositing the Mössbauer active 57Fe isotope with 95% enrichment. Samples with Fe layers of nominal thickness dFe  = 2.6 nm and Si spacers of dSi  = 1.5 nm were prepared by thermal evaporation onto a GaAs(001) substrate with an intermediate Ag(001) buffer layer. HRTEM images showed that Si layers grow amorphous and the epitaxial growth of the Fe is good only for the first deposited layer. The CEMS spectra show that at all Fe/Si and Si/Fe interfaces a paramagnetic c-Fe1− x Si phase is formed, which contains 16% of the nominal Fe deposited in the Fe layer. The bottom Fe layer, which is in contact with the Ag buffer, also contains α-Fe and an Fe1− x Si x alloy that cannot be attributed to a single phase. In contrast, the other two layers only comprise an Fe1− x Si x alloy with a Si concentration of ≃0.15, but no α-Fe.
DescripciónUnder the terms of the Creative Commons Attribution 3.0 Unported License to their work.
Versión del editorhttp://dx.doi.org/10.1063/1.4887522
URIhttp://hdl.handle.net/10261/118316
DOI10.1063/1.4887522
Identificadoresdoi: 10.1063/1.4887522
issn: 0021-8979
e-issn: 1089-7550
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