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Consequences of niobium doping for the ferromagnetism and microstructure of anatase Co:TiO 2 films
S.X. Zhang, S.B. Ogale, L.F. Fu, , D.C. Kundaliya, W. Ramadan, N.D. Browning, T. Venkatesan
Published in
Volume: 88
Issue: 1
It is shown that dilute niobium doping has a significant effect on the ferromagnetism and microstructure of dilutely cobalt-doped anatase TiO 2 films. Epitaxial films of anatase TiO 2 with 3% Co, without and with 1% niobium doping were grown by pulsed-laser deposition at 875°C at different oxygen pressures. For growth at 10 -5 Torr niobium doping suppresses the ferromagnetism, while it enhances the same in films grown at 10 -4 Torr. High-resolution Z-contrast scanning transmission electron microscopy and electron energy loss spectroscopy show uniform surface segregation of cobalt-rich Ti 1-x-yCo xNb yO 2-δ phase, but without cobalt metal clusters. © 2006 American Institute of Physics.
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