Abstract
An experimental evidence of the effects of iron on the magnetic and local electronic properties of ${\text{TiO}}_{2}$ single crystals is provided. When ferromagnetic rutile ${\text{TiO}}_{2}$ single crystals are doped with Fe ions, an enhancement of the saturation magnetic moment is observed, along with a transfer of electrons to $\text{Fe}\text{ }3d$ and $\text{Ti}\text{ }3d$ levels. Indeed, the analysis of core-level photoemission data shows that addition of iron has the effect (i) to promote electron charge transfer from $\text{O}\text{ }2p$ band to localized $\text{Fe}\text{ }3d$ orbitals and (ii) to reduce titanium ions by introducing $3{d}^{1}$ electronic states in the otherwise empty $3d$ band of pure ${\text{TiO}}_{2}$. These effects, resulting from the incorporation of both transition-metal ion dopants and oxygen vacancies, increase the local magnetic moments that can contribute to long-range ferromagnetic ordering.
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