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Nano granular metallic iron (Fe) and titanium dioxide (TiO$_{2-\delta}$) wereco-deposited on (100) lanthanum aluminate (LaAlO$_3$) substrates in a lowoxygen chamber pressure using a pulsed laser ablation deposition (PLD)technique. The co-deposition of Fe and TiO$_2$ resulted in $\approx$ 10 nmmetallic Fe spherical grains suspended within a TiO$_{2-\delta}$ matrix. Thefilms show ferromagnetic behavior with a saturation magnetization of 3100 Gaussat room temperature. Our estimate of the saturation magnetization based on thesize and distribution of the Fe spheres agreed well with the measured value.The film composite structure was characterized as p-type magnetic semiconductorat 300 K with a carrier density of the order of $ 10^{22} /{\rm cm^3}$. Thehole carriers were excited at the interface between the nano granular Fe andTiO$_{2-\delta}$ matrix similar to holes excited in the metal/n-typesemiconductor interface commonly observed in Metal-Oxide-Semiconductor (MOS)devices. From the large anomalous Hall effect directly observed in these filmsit follows that the holes at the interface were strongly spin polarized.Structure and magneto transport properties suggested that these PLD films havepotential nano spintronics applications.

Nano granular metallic Fe - oxygen deficient TiO$_{2-\delta}$ composite films: A room temperature, highly carrier polarized magnetic semiconductor