旋度相关飞秒laser自旋转移矩诱导畴壁运动
Domain-wall motion induced by spin transfer torque delivered by helicity-dependent femtosecond laser
摘要：
在具有垂直各向异性的磁线中，仅用电流或仅用圆偏振光移动磁畴需要高功率。在这里，我们建议同时使用短电流脉冲和飞秒激光脉冲来减少它。金属丝由垂直磁化的Pt/Co/Ni/Co/Pt薄膜制成。畴壁的位移被发现是依赖于激光的螺旋度。基于对电流诱导畴壁运动的定量分析，与自旋转移矩的贡献相比，自旋轨道矩的贡献可以忽略。自旋转移力矩的有效场是从脉冲场畴壁测量中提取的。最后，我们的结果可以用Fatuzzo-Labrune模型来描述，并考虑由于偏振激光束的有效场，由于自旋转移力矩的有效场，和高斯温度分布的激光光斑。
英文摘要：
In magnetic wires with perpendicular anisotropy, moving domain with only current or only circularly polarized light requires a high power. Here, we propose to reduce it by using both short current pulses and femtosecond laser pulses simultaneously. The wires were made out of perpendicularly magnetized film of Pt/Co/Ni/Co/Pt. The displacement of the domain wall is found to be dependent on the laser helicity. Based on a quantitative analysis of the current-induced domain wall motion, the spin orbit torque contribution can be neglected when compared to the spin transfer torque contribution. The effective field of the spin transfer torque is extracted from the pulsed field domain wall measurements. Finally, our result can be described using the Fatuzzo-Labrune model and considering the effective field due to the polarized laser beam, the effective field due to spin transfer torque, and the Gaussian temperature distribution of the laser spot.
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