Domain wall motion by localized temperature gradients
Domain wall motion by localized temperature gradients
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DOI：
10.1103/physrevb.95.064419
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发表时间：
2017-02-21
影响因子：
3.7
通讯作者：
Lopez-Diaz, Luis
中科院分区：
文献类型：
--
作者：
Moretti, Simone;Raposo, Victor;Lopez-Diaz, Luis
在随机Landau-Lifshitz-Bloch方程的框架内，研究了坡莫合金纳米带中局域高斯温度分布引起的磁畴壁运动。分离并比较了熵矩和磁子自旋转移矩对热致DW运动的不同贡献。磁振子自旋转移矩的分析包括对样品中热激发磁振子的描述。第三个驱动力，由于热诱导偶极场的发现和描述。最后，热诱导DWmotion研究在现实条件下，考虑到边缘粗糙度。结果给出了定量的见解不同mechanisms负责畴壁运动的温度梯度，并允许与实验结果进行比较。
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.