Magnetic and Electrical Properties of (Mn, La)‐Codoped SrTiO3 Thin Films

Mn-doped SrTiO3-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 SrTiO3 phases. Optical and electrical measurements indicate that La codoping can make the band gap of SrTiO3 narrow and cause the leakage current to increase. Ferromagnetic behavior can be observed in these Mn- and/or La-codoped SrTiO3-based thin films at room temperature, which should be ascribed to the magnetic coupling between the induced free electrons and Mn 3d spins.