  We inject current pulses into uniformly magnetized patterns of thin films of
the itinerant ferromagnet SrRuO3, while monitoring the effective temperature of
the patterns during the current injection. We gradually increase the amplitude
of the pulses until magnetization reversal occurs. We observe magnetization
reversal induced by current above a temperature-dependent threshold and show
that this effect is not simply due to sample heating or Oersted fields. We
discuss the applicability of the current-induced spin-wave instability
scenario.
