Multiferroic coupling in nanoscale BiFeO3
  Using the results of x-ray and neutron diffraction experiments, we show that the ferroelectric polarization, in ~22 nm particles of BiFeO3, exhibits a jump by ~30% around the magnetic transition point T_N (~635 K) and a suppression by ~7% under 5T magnetic field at room temperature (<<T_N). These results confirm presence of strong multiferroic coupling even in nanoscale BiFeO3 and thus could prove to be quite useful for applications based on nanosized devices of BiFeO3. 
S. Goswami, Dipten Bhattacharya, P. Choudhury, B. Ouladdiaf, and T.   Chatterji
cond-mat.mtrl-sci cond-mat.str-el