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TiO2 thin films for spintronics application: a Raman study

Rossella, F. ; Galinetto, P. ; Mozzati, M. C. ; Malavasi, L. ; Diaz Fernandez, Y. ; Drera, G. ; Sangaletti, L.

Journal of Raman spectroscopy, 2010-05, Vol.41 (5), p.558-565 [Periódico revisado por pares]

Chichester, UK: John Wiley & Sons, Ltd

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  • Título:
    TiO2 thin films for spintronics application: a Raman study
  • Autor: Rossella, F. ; Galinetto, P. ; Mozzati, M. C. ; Malavasi, L. ; Diaz Fernandez, Y. ; Drera, G. ; Sangaletti, L.
  • Assuntos: diluted magnetic semiconductors ; oxygen vacancies ; Raman spectroscopy ; thin films ; titanium dioxide
  • É parte de: Journal of Raman spectroscopy, 2010-05, Vol.41 (5), p.558-565
  • Notas: Italian Grant-Fondazione Cariplo - No. 2006-0686
    ArticleID:JRS2465
    istex:AEB1075A48CB7F1EF87E03F55C0A71A9D79ECF9C
    ark:/67375/WNG-45M2RQXS-6
  • Descrição: We present the results of a systematic study performed by micro‐Raman spectroscopy on pure anatase, pure rutile and mixed anatase–rutile TiO2 thin films, deposited by radio frequency magnetron sputtering on quartz substrates, with different thicknesses. The crystal structures of the as‐deposited films were unambiguously determined and a good crystalline homogeneity was revealed by a systematic mapping of the samples. In the mixed‐phase films, the relative amount of the two phases was monitored by a simple analysis of the components of the multi‐Lorentzian fitting curves. For the single‐phase films, the influence of the thickness and the effect of different thermal treatments, carried out to obtain series of thin films differing only for oxygen content, are discussed. The analysis of the scattered light has provided indication about the presence of an interface layer between the substrate and the film, which can play a role in driving the interesting magnetic properties exhibited by our samples, which are of potential usefulness for spintronics application. The results obtained from other techniques are briefly reported and discussed in relation to our systematic Raman characterization. This study points out how Raman investigation can provide suggestions toward the understanding of the complex physical phenomena leading to room‐temperature ferromagnetism in TiO2 thin films. Copyright © 2009 John Wiley & Sons, Ltd. Micro‐Raman spectroscopy is used for investigating TiO2 thin films sputtered on quartz substrates. The crystalline phases are determined. Mapping reveals good local and global crystalline homogeneity. In the mixed phase samples, the weights of the different phases are monitored. The effect of thermal treatments is highlighted, and the oxygen stoichiometry is derived. An interface layer between substrate and film is revealed, which can play a role in driving the magnetic properties of our samples and potentially useful for spintronics application.
  • Editor: Chichester, UK: John Wiley & Sons, Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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