Temperature dependence of spin-transfer-induced switching of nanomagnets
  We measure the temperature, magnetic-field, and current dependence for the switching of nanomagnets by a spin-polarized current. Depending on current bias, switching can occur between either two static magnetic states or a static state and a current-driven precessional mode. In both cases, the switching is thermally activated and governed by the sample temperature, not a higher effective magnetic temperature. The activation barriers for switching between static states depend linearly on current, with a weaker dependence for dynamic to static switching. 
I. N. Krivorotov, N. C. Emley, A. G. F. Garcia, J. C. Sankey, S. I.   Kiselev, D. C. Ralph and R. A. Buhrman