Ferroelectric charge order stabilized by antiferromagnetism in   multiferroic LuFe2O4
  Neutron diffraction measurements on multiferroic LuFe2O4 show changes in the antiferromagnetic (AFM) structure characterized by wavevector q = (1/3 1/3 1/2) as a function of electric field cooling procedures. The increase of intensity from all magnetic domains and the decrease in the 2D magnetic order observed below the Neel temperature are indicative of increased ferroelectric charge order. The AFM order changes the dynamics of the CO state, and stabilizes it. It is determined that the increase in electric polarization observed at the magnetic ordering temperature is due to a transition from paramagnetic 2D charge order to AFM 3D charge order. 
A.M. Mulders, M. Bartkowiak, J.R. Hester, E. Pomjakushina, K. Conder
cond-mat.str-el cond-mat.mtrl-sci