Spin-transfer-torque-driven domin-wall dynamics in Permalloy nanowires
Spin-transfer-torque-driven domin-wall dynamics in Permalloy nanowires
复制标题
坡莫合金纳米线中自旋转移扭矩驱动的主壁动力学
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. L. Erskine
中科院分区：
文献类型：
--
作者：
Shuqiang Yang;J. L. Erskine
利用高时间分辨率磁光技术研究了脉冲电流驱动下坡莫合金纳米线中畴壁的动力学行为。时间分辨的测量揭示了即时位移成比例的电流密度以上的一个明确定义的阈值和产量值DW速度和自旋翻转效率是一个因素的10比先前的实验中确定的。与终止的电流脉冲的壁位移的随机变化进行观察。实验结果表明，绝热和非绝热自旋转移力矩机制的存在下，但没有出现被充分解释现有的理论模型。
Pulse-current-driven domain-wall (DW) dynamics in Permalloy nanowires are studied using high-temporal-resolution magneto-optical techniques. The time-resolved measurements reveal prompt displacements proportional to current density above a well-defined threshold and yield values of DW velocity and spin-flip efficiency that are a factor of 10 higher than those determined in prior experiments. A stochastic variation in the wall displacements associated with termination of the current pulse is observed. The experimental results suggest the presence of both adiabatic and nonadiabatic spin-transfer-torque mechanisms, but do not appear to be fully explained by existing theoretical models.