Magnetic properties of Fe implanted SrTiO3 perovskite crystal

The results of investigations of magnetic properties of SrTiO3 perovskite crystal implanted with 40 keV Fe ions at the fluencies between 0.5 × 1017 and 1.5 × 1017 ion/cm2 are presented. It has been revealed that high-fluency implantation with Fe ions results in the formation of a granular metal particulate composite in the irradiated near-surface layer of SrTiO3 substrate, which exhibits remarkable ferromagnetic behavior. The measurements of the temperature dependence of the magnetic moment showed that the samples exhibit blocking temperature at about 350 K, above which a superparamagnetic behavior has been observed. Ferromagnetic ordering and magnetic hysteresis loops were observed in Fe implanted SrTiO3 at the temperatures lower than 350 K. It has been shown that the magnetization of the ferromagnetic state depends on the fluency of implantation.