Amorphous Cr x Ti 1-x O 2 films with different Cr concentrations of 0 ≤ x ≤ 0.16 were prepared by cosputtering method at room temperature. All as-deposited samples show hysteresis behavior from 2 to 340 K and the Curie temperatures are well above 390 K. The saturation magnetization is about 3.21 × 10 -1 μ B /Cr for x=0.05 at 340 K and decreases with increasing Cr dopant. After annealing at temperature above 300°C, the films crystallized into anatase structure and lost their ferromagnetic property. The results indicate that the ferromagnetism in amorphous Cr-doped TiO 2 films is intrinsic and the structural defects play an important role in the ferromagnetism of Cr:TiO 2 system.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)