Applied Physics A

, Volume 93, Issue 3, pp 669–674 | Cite as

Growth of the magnetic semiconductor Fe2−xTixOδ thin films by pulsed laser deposition

  • E. Popova
  • H. Ndilimabaka
  • B. Warot-Fonrose
  • M. Bibes
  • N. Keller
  • B. Berini
  • F. Jomard
  • K. Bouzehouane
  • Y. Dumont
Article

Abstract

The understanding and control of the ilmenite–hematite solid solutions (Fe2−xTixOδ or IH) thin film structure and properties are crucial for spintronics applications. Good quality films of Fe2−xTixOδ on Al2O3(0001) substrates were obtained by pulsed laser deposition. For the studied compositions (x=1, 0.7, 0.5) in a wide oxygen pressure range all the films were epitaxial, with flat interfaces, and without secondary phases. Unconventional lattice strain relaxation with the increase of in-plane lattice parameter above its relaxed bulk value was observed for different film compositions, oxygen pressures, substrate temperatures, and film growth rates. This phenomenon is most likely explained by the buckling of a few first film monolayers because of a significant compressive stress induced on the film by the sapphire substrate. The IH thin films with x=0.7 and 0.5 exhibited the properties of a room temperature magnetic semiconductor. The resistivity changed over three orders of magnitude in the studied pressure range, thus clearly demonstrating the important role of oxygen stoichiometry in the creation of carriers.

PACS

75.50.Pp 68.55.A- 81.15.Fg 61.05.Jh 73.61.Le 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • E. Popova
    • 1
  • H. Ndilimabaka
    • 1
  • B. Warot-Fonrose
    • 2
  • M. Bibes
    • 3
  • N. Keller
    • 1
  • B. Berini
    • 1
  • F. Jomard
    • 1
  • K. Bouzehouane
    • 4
  • Y. Dumont
    • 1
  1. 1.Groupe d’Etude de la Matière CondenséeCNRS-UVSQVersaillesFrance
  2. 2.Centre d’Elaboration de Matériaux et d’Etudes StructuralesCNRSToulouseFrance
  3. 3.Institut d’Electronique FondamentaleOrsayFrance
  4. 4.Unité Mixte de Physique CNRS-ThalesPalaiseauFrance

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