Field induced quantum-Hall ferromagnetism in suspended bilayer graphene
  We have measured the magneto-resistance of freely suspended high-mobility bilayer graphene. For magnetic fields $B>1$ T we observe the opening of a field induced gap at the charge neutrality point characterized by a diverging resistance. For higher fields the eight-fold degenerated lowest Landau level lifts completely. Both the sequence of this symmetry breaking and the strong transition of the gap-size point to a ferromagnetic nature of the insulating phase developing at the charge neutrality point. 
H. J. van Elferen, A. Veligura, E. V. Kurganova, U. Zeitler, J. C.   Maan, N. Tombros, I. J. Vera-Marun and B. J. van Wees
cond-mat.mes-hall