Abstract
A rather complete work on transition-metal (TM)-doped TiO 2 thin films has been done and room ferromagnetism (FM) is found in the whole series of Sc/V/Cr/Mn/Fe/Co/Ni-doped TiO 2 films. Not only is it remarkable that for the first time, FM at high temperature was achieved in TM-doped TiO 2, but also a very big magnetic moment of 4.2μ B/atom could be obtained, and direct evidences of real ferromagnets with big domains were shown as well. A similar chemical trend was achieved in TM-doped In 2O 3 films, however, the observed magnetic moment is rather modest, with the maximal value is of only 0.7μ B/atom for Ni-doped In 2O 3 films. As regards TM-doped SnO 2 films, observed magnetic moments could be very large, with the maximum saturation of 6μ B per impurity atom for Cr-doped SnO 2 thin films, but it could be influenced very much depending on substrate types. On the other hand, results on TM-doped ZnO films interestingly have revealed that in these systems, the magnetism more likely resulted from defects and/or oxygen vacancies.
Published Version
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