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.
Highlights
Controlling magnetic domain walls (DWs) in ferromagnetic (FM) and antiferromagnetic (AFM) nanostructures has recently attracted considerable interest due to its potential for new logic [1] and memory devices [2] and for the very rich physics involved
The DW is inside the thermal gradients (TGs) [∇T (XDW) = 0], and its motion can be attributed mostly to the entropic torque (ET) [19,20,21]
We recall that the temperature dependence of m and A is given by averaged high-frequency magnons which cannot be included in the thermal fluctuations due to the spatial discretization
Summary
Controlling magnetic domain walls (DWs) in ferromagnetic (FM) and antiferromagnetic (AFM) nanostructures has recently attracted considerable interest due to its potential for new logic [1] and memory devices [2] and for the very rich physics involved. Spin caloritronics [16] is a new emerging subfield of spintronics which aims to understand such complex interaction between heat, charge, and spin transport. One of the interesting features of thermally induced DW motion is its applicability to FM insulators and AFM [17]. Since it does not imply charge transport and related Joule heating, it would avoid energy dissipation in FM conductors, or it might represent a solution for harvesting the heat dissipated in electronic circuits [16,18]
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