论文标题
泵 - 以MHz重复速率的光诱导磁化动力学的探针X射线显微镜
Pump--probe x-ray microscopy of photo-induced magnetization dynamics at MHz repetition rates
论文作者
论文摘要
我们在扫描传输X射线显微镜下通过量身定制的红外泵激光器进行时间分辨的X射线显微镜测量，并通过量身定制的红外泵激光器进行光启示。具体而言，我们想象激光诱导的消极作用和在几纳秒时间尺度上进行的薄铁磁GDFE膜的重新网络化。通过其他反射器和热水趋化层控制样品上的热载荷，使我们能够以\ si {50} {\ mega \ hertz}的重复速率进行无破坏测量。光启动和受控退火效应的近场增强导致侧向异质磁化动力学，我们将使用\ si {30} {\ nano \米}痕迹进行空间分辨率。我们的工作为研究纳米量表的照片引起的动力学开辟了新的机会，并可以访问Picsecond到达Nansecond TimeScales，这是技术性相关性的，尤其是在磁性领域。
We present time-resolved scanning x-ray microscopy measurements with picosecond photo-excitation via a tailored infrared pump laser at a scanning transmission x-ray microscope. Specifically, we image the laser-induced demagnetization and remagnetization of thin ferrimagnetic GdFe films proceeding on a few nanoseconds time scale. Controlling the heat load on the sample via additional reflector and heat-sink layers allows us to conduct destruction-free measurements at a repetition rate of \SI{50}{\mega\hertz}. Near-field enhancement of the photo-excitation and controlled annealing effects lead to laterally heterogeneous magnetization dynamics which we trace with \SI{30}{\nano\meter} spatial resolution. Our work opens new opportunities to study photo-induced dynamics on the nanometer scale, with access to picosecond to nanosecond timescales, which is of technological relevance, especially in the field of magnetism.
