Influence of thermal coupling on spin avalanches in Mn12-acetate
  The effect of thermal coupling on spin avalanches in Mn12-acetate has been probed using a single crystal assembly. Time-resolved, synchronized measurements of magnetization and temperature are reported. Unusually low avalanche trigger fields occur when thermal coupling to the bath is weak. A temperature rise observed at zero magnetic field is attributed to a change in magnetostatic energy. 
C.H. Webster, O. Kazakova, J.C. Gallop, P.W. Josephs-Franks, A.   Hernandez-Minguez and A.Ya. Tzalenchuk