Amorphous CrxTi1−xO2 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 2to340K and the Curie temperatures are well above 390K. The saturation magnetization is about 3.21×10−1μB∕Cr for x=0.05 at 340K 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 TiO2 films is intrinsic and the structural defects play an important role in the ferromagnetism of Cr:TiO2 system.
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Wang et al. (2006) studied this question.
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