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The temperature in a ferromagnetic nanostripe with a notch subject to Joule heating has been studied in detail.\udWe first performed an experimental real-time calibration of the temperature versus time as a 100 ns current pulse  was  injected  into  a  Permalloy  nanostripe.  This calibration  was  repeated  for  different  pulse  amplitudes and  stripe  dimensions  and  the  set  of  experimental  curves  were  fitted  with  a  computer  simulation  using  the Fourier thermal conduction equation. The best fit of these experimental curves was obtained by including the temperature-dependent behavior of the electrical resistivity of the Permalloy and of the thermal conductivity of thesubstrate(SiO2). Notably, a nonzero interface thermal resistance between the metallic nanostripe and thesubstrate was also necessary to fit the experimental curves. We found this parameter pivotal to understand ourresults and the results from previous works. The higher current density in the notch, together with the interface thermal resistance, allows a considerable increase of the temperature in the notch, creating a large horizontal thermal gradient. This gradient, together with the high temperature in the notch and the larger current density close to the edges of the notch, can be very influential in experiments studying the current assisted domain wall motion

Joule heating in ferromagnetic nanostripes with a notch