Figure 7
From: Magnetic structures and dynamics of multiferroic systems obtained with neutron scattering
(a) Lattice and magnetic structures of BiFeO3 (adapted from reference 47). Red lines show the perovskite pseudo-cubic cell. (b) Top. Applied electric field E switches ferroelectric domain A into domain B. The magnetic propagation vectors τi rotate together with the electric polarisation vector P. Bottom. Volume fractions of the domains A and B in an applied field. Both the magnetic signal (τi wave vectors) and the structural signal (due to the elongated [111] diagonal) give essentially the same dependence. (Adapted from reference 43) (c) Within a single-ferroelectric domain, applied electric field or uniaxial pressure convert one equivalent magnetic domain (τi) into another. Dashed arrow shows corresponding rotation of the magnetic easy plane. Bottom. Volume fractions of the domains τ1 and τ2 in an electric field. (No domain τ3 was detected in this sample; adapted from references 46,50.)
