TITLE

Ferromagnetism in nanocrystalline epitaxial Co:TiO2 thin films

AUTHOR(S)
Pradhan, A. K.; Hunter, D.; Dadson, J. B.; Williams, T. M.; Zhang, Kai; Lord, K.; Lasley, B.; Rakhimov, R. R.; Zhang, Jun; Sellmyer, D. J.; Roy, U. N.; Cui, Y.; Burger, A.; Hopkins, C.; Pearson, N.; Wilkerson, A. L.
PUB. DATE
May 2005
SOURCE
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p222503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the observation of remarkable room-temperature ferromagnetism in nanocrystalline epitaxial Co:TiO2 films grown on sapphire (0001) substrates by a pulsed-laser deposition technique using high-density targets. The films were characterized by x-ray measurements, atomic force microscopy, micro-Raman, electron-paramagnetic resonance, and magnetization studies. The films exhibit three-dimensional islandlike growth that contains nanocrystalline particles. Our experimental results suggest that the remarkable ferromagnetism in Co:TiO2 films is controlled either by the interstitial Co2+ ions or small clusters, which are mainly present at the interface and on the surface of the films. Our work clearly indicates that Co interstitials and nanoclusters cause room-temperature ferromagnetism in Co-doped TiO2.
ACCESSION #
17249940

 

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