Please use this identifier to cite or link to this item: http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/1331
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dc.contributor.authorARAGON, F. F. H.-
dc.contributor.authorAQUINO, J. C. R-
dc.contributor.authorARDISSON, José Domingos-
dc.contributor.authorCOAQUIRA, J. A. H.-
dc.date.accessioned2019-05-23T11:55:44Z-
dc.date.available2019-05-23T11:55:44Z-
dc.date.issued2019-
dc.identifier.issn1369-8001pt_BR
dc.identifier.urihttp://www.repositorio.cdtn.br:8080/jspui/handle/123456789/1331-
dc.description.abstractIn the present work, the effect of the post-deposition annealing process in an air atmosphere on the structural and magnetic properties of the ternary Fe/SnO2/Fe thin film, deposited by the sputtering technique was reported. X-ray diffraction (XRD) pattern confirms the formation of alpha-iron, magnetite and fin dioxide phases in the as-deposited film. Meanwhile, after the thermal annealing, the formation of hematite and fin dioxide phases was determined. Magnetization (M) measurements reveal some features after the annealing: i) a reduction of the coercive field (H-c), which has been assigned to the presence of hematite, and ii) the transformation of alphairon/magnetite phases into the hematite phase in accordance with results obtained from XRD data analysis. Those results were also confirmed by room temperature Conversion electron Mossbauer spectroscopy (CEMS) measurements carried out using a Co-57(Rh) source. Furthermore, the doublets of the CEMS spectrum of the asdeposited film (21%) has been assigned to the signal of Fe3+ and Fe2.5+ (mixture of Fe3+ and Fe (2+)) ions, which diffuse into the SnO2 matrix. The spectral area of those doublets is clearly reduced to 3% after the thermal annealing. It suggests the migration of the Fe ions from the non-magnetic phase to the magnetic phase. On the other hand, CEMS spectrum of the as-deposited film carried out with using a Sn-119m source is well modeled with a doublet and a sextet. The doublet was assigned to Sn4+ ions of the SnO2 phase; meanwhile, the sextet was assigned to Sn4+ ions located at interstitial and/or substitutional sites of the alpha-iron/magnetite phases. Those fin ions sense the supertransferred hyperfine field from Fe neighbor. After the thermal annealing, the CEMS spectrum was well modeled with only a doublet related to SnO2 phase, suggesting that the fin ions have been out diffused from the magnetic phase (alpha-iron and magnetite) and incorporate into the no magnetic o-SnO2.pt_BR
dc.format.extent182-187pt_BR
dc.language.isoen_USpt_BR
dc.rightsRpt_BR
dc.subjectInorganic compoundspt_BR
dc.subjectMagnetic materialspt_BR
dc.subjectThermal annealingpt_BR
dc.titleThermal annealing effects on the structural, magnetic and hyperfine properties of the Fe/SnO2/Fe thin film deposited by RF sputtering methodpt_BR
dc.typeArtigo Periódicopt_BR
dc.coverageIpt_BR
dc.creator.affiliationUniversidade de Brasília,UNB, DF, Brasilpt_BR
dc.creator.affiliationCentro de Desenvolvimento da Tecnologia Nuclear, CDTN, Belo horizonte, MG, Brasilpt_BR
dc.identifier.vol93pt_BR
dc.title.journalMATERIALS SCIENCE IN SEMICONDUCTOR PROCESSINGpt_BR
Appears in Collections:Artigo de periódico

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