Initial stages of iron silicide formation on the Si(100)2×1 surface

Gomoyunova, M. V.; Malygin, D. E.; Pronin, I. I.; Voronchikhin, A. S.; Vyalikh, D. V.; Молодцов, С. Л.

doi:10.1016/j.susc.2007.09.007

Cited by 43 publications

(23 citation statements)

References 36 publications

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“…According to previous works on the Fe-Si interfaces, 3,5,11,12,15,[27][28][29][30][31] these compounds would have a magnetic Fe 1Àx Si x alloy, and a paramagnetic silicide. The non-stoichiometric c-Fe 1Àx Si phase (0 x 0.5) has been proposed as that paramagnetic compound.…”

Section: B Compositional Study By Cemsmentioning

confidence: 95%

“…The saturation magnetization of the full multilayer can be estimated from that distribution. Since c-Fe 1Àx Si is paramagnetic and considering: (a) that the average Si concentration for the inhomogeneous Fe-Si alloy at the bottom layer is the same than that of the other two layers (x ¼ 0.15), and (b) the saturation magnetization values are 1740 emu/cm 3 and 1230 emu/cm 3 for a-Fe and Fe 0.85 Si 0.15 , 43 respectively, one obtains an estimated magnetization M s ¼ 7.37 Â 10 À4 emu/cm 2 at RT. The experimental magnetization measured at RT with a SQUID magnetometer, after subtracting the magnetic contribution of the 1 nm Fe buffer layer, is 6.84 Â 10 À4 emu/cm 2 .…”

Section: Middle and Top 57 Fe Layersmentioning

confidence: 99%

“…Gomoyunova et al 3 reported experimental results which support the existence of three stages in the Fe deposition on Si(100) at room temperature (RT): 4,5 formation of an Fe(Si) alloy, followed by its transformation into the stoichiometric Fe 3 Si phase, and the growth of an Fe film. The critical Fe thickness necessary for that transformation was found to be 5 Fe monolayers.…”

Section: Introductionmentioning

confidence: 97%

“…Extensive work on the determination of the iron silicide constituents at the interfaces has been reported, [3][4][5][6][7][8][9][10][11][12][13][14][15] but the characterization of its dependence on the layer position in a multilayered stack has not been studied yet. This will be tackled in the present work on an (Fe/Si) 3 multilayer by 57 Fe conversion electron M€ ossbauer spectroscopy (CEMS), which allows studying Fe layers at selected depth.…”

Section: Introductionmentioning

confidence: 99%

“…This will be tackled in the present work on an (Fe/Si) 3 multilayer by 57 Fe conversion electron M€ ossbauer spectroscopy (CEMS), which allows studying Fe layers at selected depth. To this end we prepared a series of samples consisting of three sequentially deposited Fe/Si bilayers, where only one Fe layer consisted completely of highly enriched (95%) 57 Fe, while the other two were made of natural Fe, which contains '2.7% 57 Fe.…”

Section: Introductionmentioning

confidence: 99%

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

Badía-Romano

Rubín

Magén

et al. 2014

Journal of Applied Physics

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The 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−xSi 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−xSix alloy that cannot be attributed to a single phase. In contrast, the other two layers only comprise an Fe1−xSix alloy with a Si concentration of ≃0.15, but no α-Fe.

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