Multiferroic BiFeO at room T

Multiferroic Phase Transition near Room Temperature in BiFeO3 Films.
I. C. Infante, J. Juraszek, S. Fusil, B. Dupé, P. Gemeiner, O. Diéguez, F. Pailloux, S. Jouen, E. Jacquet, G. Geneste, J. Pacaud, J. Íñiguez, L. Bellaiche, A. Barthélémy, B. Dkhil, and M. Bibes
Phys. Rev. Lett. 107, 237601 (2011)

Hyperfine field distributions of the T-like component at different temperatures (e) and temperature dependence of the average hyperfine fields (f ). Dashed lines are Brillouin functions for Fe3þ (S ¼ 5=2) fitted to the data; solid lines correspond to model Hamiltonian simulations.