Depth-resolved distribution of ultrafast spin currents and fluctuation in magnetic structures

我们提出利用超快XUV和软x射线磁反射率实验在HHG和XFEL光源下直接测量激光激发的磁性多层样品内部自旋和电荷密度的超快空间演化。利用超短FEL脉冲的相干性，利用共振磁x射线光子相关光谱学测量了自旋和电荷密度的时间波动。这两个信息，自旋和电荷密度的时间演化及其各自的波动将有助于揭示超快磁化动力学过程的微观细节。

We propose to directly measure the ultrafast spatial evolution of laser-excited spin and charge densities inside magnetic multilayer samples employing ultrafast XUV and soft X-ray magnetic reflectivity experiments at HHG and XFEL sources. Using the coherence properties of the ultra-short FEL pulses we also aim at measuring the temporal fluctuations of spin and charge densities by means of resonant magnetic X-ray photon correlation spectroscopy. Both information, the temporal evolution of the spin and charge densities and their respective fluctuations will help to unravel the microscopic details of processes involved in ultrafast magnetization dynamics.