Mn‐doped SrTiO 3 ‐based thin films have been prepared by a simple sol–gel spin‐coating method on silicon substrate. X‐ray diffraction and high‐resolution transmission electron microscopy reveal that these thin films are composed of amorphous and crystalline SrTiO 3 phases. Optical and electrical measurements indicate that La codoping can make the band gap of SrTiO 3 narrow and cause the leakage current to increase. Ferromagnetic behavior can be observed in these Mn‐ and/or La‐codoped SrTiO 3 ‐based thin films at room temperature, which should be ascribed to the magnetic coupling between the induced free electrons and Mn 3 d spins.
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Zhang et al. (2008) studied this question.
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