The European Physical Journal B

, Volume 79, Issue 2, pp 185–195 | Cite as

Magnetic and transport properties of transition-metal implanted ZnO single crystals

  • R. P. Borges
  • B. Ribeiro
  • A. R.G. Costa
  • C. Silva
  • R. C. da Silva
  • G. Evans
  • A. P. Gonçalves
  • M. M. Cruz
  • M. Godinho


ZnO single crystals were implanted with Mn, Co and Ni with fluences between 1 × 1016 cm-2 and 1 × 1017 cm-2 and energy of 200 keV. Results indicate that aggregation of transition metal ions in the as implanted state occurs only in the case of Ni. After an annealing stage to recover the ZnO structure aggregation occurs for the higher fluences of all implanted species. For lower concentrations paramagnetic behaviour with magnetic moments close to those of individual ions is observed. No polarised impurity band is formed as a result of the presence of transition metal ions and all samples show electrical conduction by carriers in extended states of ZnO. Significant values of magnetoresistance are measured at low temperatures, where electrical transport is described by hopping mechanisms between localized states. The sign of the magnetoresistance is dependent of the doping ion and is correlated with the observed aggregation.


Superparamagnetic Behaviour Paramagnetic Behaviour Particle Magnetic Moment High Density Magnetic Recording Medium Rump Code 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • R. P. Borges
    • 1
  • B. Ribeiro
    • 1
  • A. R.G. Costa
    • 1
  • C. Silva
    • 1
  • R. C. da Silva
    • 2
    • 3
  • G. Evans
    • 1
    • 4
  • A. P. Gonçalves
    • 1
    • 5
  • M. M. Cruz
    • 1
    • 4
  • M. Godinho
    • 1
    • 4
  1. 1.Centro de Física da Matéria Condensada da Universidade de LisboaLisboaPortugal
  2. 2.Departamento de Física, Faculdade de CiênciasUniversidade de LisboaLisboaPortugal
  3. 3.Laboratório de Feixe de Iões, Dep. FísicaInstituto Tecnológico e NuclearSacavémPortugal
  4. 4.Centro de Física Nuclear da Universidade de LisboaLisboaPortugal
  5. 5.Departamento de QuímicaInstituto Tecnológico e NuclearSacavémPortugal

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