Phase transitions in multiferroic BiFeO3 crystals, thin-layers, and   ceramics: Enduring potential for a single phase, room-temperature   magnetoelectric 'holy grail'
  Magnetic phase transitions in multiferroic bismuth ferrite (BiFeO3) induced by magnetic field, epitaxial strain, and composition modification are considered. These transitions from a spatially modulated spin spiral state to a homogenous antiferromagnetic one are accompanied by the release of latent magnetization and a linear magnetoelectric effect that makes BiFeO3-based materials efficient room-temperature single phase multiferroics. 
A. M. Kadomtseva, Yu.F. Popov, A.P. Pyatakov, G.P. Vorob'ev, A.K.   Zvezdin, and D. Viehland