Oxygen vacancies control of the electrical optical and magnetic properties of Fe0.05Ti0.95O2 epitaxial films

High quality Fe-doped doped TiO2 films were epitaxially grown on MgF2 substrate by pulsed laser deposition. X ray diffraction and Raman spectra proved pure rutile phase. High resolution TEM further demonstrated the epitaxial relationship between rutile phased TiO2 and MgF2 substrate is 110 TiO2 // 110 MgF2. Room temperature ferromagnetism was detected by alternative gradient magnetometer. By increasing the ambient oxygen pressure, magnetization showed monotoneous decrease while absorption edge showed red shift. Transport property measurement demonstrates a strong correlation between magnetization and carrier concentration, the influence of ambient oxygen pressure on magnetization can be well explained by a modified Bound Magnetization Polarization model.