Annealing temperature dependence of ferromagnetism of rutile Co–TiO2 (100)

Chai, J. W.; Pan, J. S.; Wang, S. J.; Huan, C. H. A.; Chen, J. S.; Xu, S.
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p222505
Academic Journal
Co overlayers of ∼3 nm have been deposited at room temperature on rutile TiO2 (100) surfaces, followed by annealing to different temperatures. Ferromagnetic behavior has been observed for all samples, but the saturation magnetic moment (μS) per Co atom is seen to decrease with increasing annealing temperature up to 530 °C. In situ photoemission studies show that the reduction of the saturation magnetic moment is accompanied by Co oxidation at high annealing temperature. However, an annealing temperature of 700 °C leads to an increase of the saturation magnetic moment. At this temperature, the formation of an additional Co–Ti–O ternary compound phase is observed by high-resolution transmission electron microscopy. It is proposed that this phase is responsible for the increase of the saturation magnetic moment. The origin of ferromagnetism might be the same as that of Co-doped TiO2.


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