Title: Domain wall motion by localized temperature gradients,
Abstract: Magnetic domain wall (DW) motion induced by a localized Gaussian temperature
profile is studied in a Permalloy nanostrip within the framework of the
stochastic Landau-Lifshitz-Bloch equation. The different contributions to
thermally induced DW motion, entropic torque and magnonic spin transfer torque,
are isolated and compared. The analysis of magnonic spin transfer torque
includes a description of thermally excited magnons in the sample. A third
driving force due to a thermally induced dipolar field is found and described.
Finally, thermally induced DW motion is studied under realistic conditions by
taking into account the edge roughness. The results give quantitative insights
into the different mechanisms responsible for domain wall motion in temperature
gradients and allow for comparison with experimental results.