Ferromagnetism and transport properties of Fe-doped reduced-rutile TiO2−δ thin films

Zhenjun Wang, Jinke Tang, Le Duc Tung, Weilie Zhou, Leonard Spinu
2003 Journal of Applied Physics  
We have investigated Fe x Ti 1Ϫx O 2Ϫ␦ (xϭ0.02, 0.06, and 0.08͒ thin films grown on ␣-Al 2 O 3 substrates by pulsed-laser deposition. X-ray diffraction results indicate that the films are single phase and of reduced-rutile type. Detailed microstructural observations reveal no measurable magnetic impurities in the films. Vibrating sample magnetometer measurements show the films are ferromagnetic at room temperature with coercivity ranging from 340 to 770 Oe. The temperature dependence of the
more » ... pendence of the resistivity shows nearly metallic behavior at room temperature but semiconducting behavior at lower temperatures. The extraordinary Hall effect with coercivities similar to those in magnetic hysteresis curves was observed at room temperature. The carriers are p type with a carrier density of about 10 22 /cm 3 .
doi:10.1063/1.1556122 fatcat:ewkcoonpinhb3geelrmkdwrcbe