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

在这个项目中，我们想要研究高横向和高时间分辨率的超薄膜、多层膜和纳米结构的磁相变附近的光致超快磁化过程。一方面，这些研究将通过磁光扫描近场显微镜进行，以进行时间分辨研究。这项技术过去已经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，瞬时磁化变化由延迟的秒激光脉冲或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.