Magnetic Properties of Bismuth Ferrite Nanopowder Obtained by   Mechanochemical Synthesis
  Multiferroic bismuth ferrite (BiFeO3) nanopowders have been obtained in room temperature by mechanical synthesis. Depending on the post-synthesis processing the nanopowders have exhibited differences in the mean sizes, presence of amorphous layer and/or secondary phases. Extended magnetic study performed for fresh, annealed and hot-pressed nanopowders have revealed substantial improvement of the magnetic properties in the as-prepared powder. 
I. Szafraniak-Wiza, B. Andrzejewski, B. Hilczer
cond-mat.mtrl-sci