论文标题
飞秒激光脉冲诱导的高血压热诱导的镁流动
Hypersonic heat-induced flows of magnons induced by femtosecond laser pulses
论文作者
论文摘要
在这项工作中，我们为铁磁双层中的亚皮秒时尺度上存在宏伟的电流及其对超快自旋动力学的影响。 Ferrimagnet GDFECO是一种已知在用飞秒激光脉冲激发后在1-2P中进行超快切换的材料。在这里，我们表明，通过施加飞秒激光脉冲引起的强热梯度，并且化学不均匀性的存在导致旋转的有效温度中的局部失衡，从而产生自旋角动量的快速传递，我们将其解释为超级旋转旋转seebeck效应。我们已经量化了这种系统中典型的强元传播。结果表明弹道木元素的传播为30nm/ps的速度。这种镁繁殖的特征时间尺度表明，这种镁运输可以在切换中发挥重要作用，这是针对实现下一代数据处理设备的关键理解，这些数据处理设备以更高的频率运行。
In this work, we present evidence for the existence of a magnonic current on the sub-picosecond time-scale in a ferrimagnetic bilayer and its effect on ultrafast spin dynamics. The ferrimagnet, GdFeCo, is a material known to undergo ultrafast switching within 1-2ps after excitation with femtosecond laser pulses. Here, we show that the strong thermal gradients induced by applying femtosecond laser pulses and the presence of chemical inhomogeneities lead to local imbalances in the effective temperatures of the spins that produces a rapid transfer of spin angular momentum, which we interpret as an ultrafast spin Seebeck effect. We have quantified the typical magnon propagation in such a system. The results show ballistic magnon propagation with 30nm/ps velocities. The characteristic time scale of such magnon propagation indicates that this magnon transport can play an important role in switching, a crucial piece of understanding towards realising next generation data processing devices that operate at much higher frequencies.
