Consequences of niobium doping for the ferromagnetism and microstructure of anatase Co: TiO2 films

Details Consequences of niobium doping for the ferromagnetism and microstructure of anatase Co: TiO2 films Consequences of niobium doping for the ferromagnetism and microstructure of anatase Co: TiO2 films

2006-01-23

arxiv.org/abs/cond-mat/0601528v1

Appl. Phys. Lett. 88, 012513 (2006)

Physics

Condensed Matter

Materials Science

17 pages, 3 figures

Scientific paper

10.1063/1.2161575

It is shown that dilute niobium doping has significant effect on the ferromagnetism and microstructure of dilutely cobalt-doped anatase TiO2 films. Epitaxial films of anatase TiO2 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-y}Co_{x}Nb_{y}O_{2-d} phase, but without cobalt metal clusters.

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