Optically induced ultrafast magnetization dynamics in the vicinity of phase transitions in nanostructures

在这个项目中，我们要研究的光学诱导，超快磁化过程的磁相变附近的薄膜，多层膜和纳米结构具有高的横向和时间分辨率。研究将在一方面进行，磁光扫描近场显微镜修改的时间分辨研究。这种技术在过去已成功地应用于静态测量。另一方面，我们将在同步辐射装置上应用时间分辨光电发射电子显微镜。SNOM和PEEM实验都将使用泵浦-探测技术，其中磁基态由飞秒激光脉冲激发，瞬态磁化变化由延迟的第二激光脉冲或X射线脉冲测量。

In this project, we want to study optically induced, ultrafast magnetization processes in the vicinity of magnetic phase transitions of ultrathin films, multilayers and nanostructures with high lateral and temporal resolution. The studies will be performed on the one hand, by magneto-optical scanning near-field microscopy modified for time-resolved studies. This technique has been successfully applied to static measurements in the past. On the other hand, we shall apply time-resolved photoemission-electron microscopy at a synchrotron-radiation facility. Both SNOM and PEEM experiments will use the pump-probe technique, where the magnetic ground state is excited by a femtosecond laser pulse, and transient magnetization changes are measured either by a delayed second laser pulse or by an x-ray pulse.