Improved room-temperature ferromagnetism in self-assembled disk-like superstructures of Fe-doped PbTiO3 nanocrystals

Large improvement of room-temperature ferromagnetism has been achieved in disk-like self-assembled Fe(1%)-doped PbTiO3 nanocrystals synthesized by a hydrothermal reaction route, where KOH was used as precipitator, and poly(ethylene glycol) as a surfactant. Fe-doped PbTiO3 nanocrystals assembled into disk-like superstructure with a diameter about 10 mu m. The saturation magnetization (M-s) of the Fe-doped PbTiO3 sample is close to 7.54 x 10(-2) emu/g with a coercive field (H-c) of 50 Oe, nearly 27 times larger than that reported previously (approximate to 2.8 x 10(-3) emu/g for Fe(1%)-doped PbTiO3 using NH3 center dot H2O as a precipitator). The improvement of ferromagnetism of the sample is attributed to the interface effect between the nanocrystals.