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Comment On 'adiabatic Domain Wall Motion And Landau-lifshitz Damping'

机译:关于“绝热畴壁运动和Landau-lifshitz阻尼”的评论

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摘要

A recent article by Stiles et al. [Phys. Rev. B 75, 214423 (2007)] has argued, using analysis of spin-transfer torque driven domain wall motion in magnetic nanowires, that the original Landau-Lifshitz form of phenom-enological damping in the micromagnetic equations of motion provides a more physically sensible interpretation than that of the Gilbert damping form, and specifically claims that only Landau-Lifshitz damping uniquely maintains the physically intuitive damping property of always reducing magnetic free energy with spin-transfer torques present. The present article considers a more general, energy-based comparison of these two sets of equations when any nonconservative (e.g., spin-transfer) torques are present. It is instead concluded here that Gilbert damping provides the more physically sensible model over the form of Landau-Lifshitz argued in favor of by Stiles et al., and that of these two only Gilbert damping guarantees a negative-definite contribution to changes in magnetic free energy.
机译:Stiles等人的最新文章。 [物理B 75,214423(2007)(Rev. B 75,214423(2007))认为,通过分析磁性纳米线中自旋转移转矩驱动的畴壁运动,微运动方程中原始的Landau-Lifshitz形式的现象学阻尼现象提供了更物理上的比吉尔伯特阻尼形式更合理的解释,并特别主张只有兰道-里夫希兹阻尼器才能唯一地保持物理上直观的阻尼特性,即在存在自旋传递扭矩的情况下始终降低磁自由能。当存在任何非保守(例如,自旋传递)扭矩时,本文将对这两组方程式进行更一般的基于能量的比较。相反,这里得出的结论是,吉尔伯特阻尼提供了比Stiles等人所主张的Landau-Lifshitz形式更物理上更敏感的模型,而这两个仅吉尔伯特阻尼保证了对自由磁通量变化的负确定贡献。能源。

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