Domain wall motion by localized temperature gradients

Abstract

[EN] 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 ofmagnonic spin transfer torque includes a description of thermally excitedmagnons in the sample. A third driving force due to a thermally induced dipolar field is found and described. Finally, thermally induced DWmotion is studied under realistic conditions by taking into account the edge roughness. The results give quantitative insights into the differentmechanisms responsible for domain wall motion in temperature gradients and allow for comparison with experimental results.