Gated detector for time-resolved photoemission microscopy

Photoemission microscopy in combination with X-ray circular dichroism is a well established tool to image magnetic domain patterns in micrometer sized structures. Apart from imaging static magnetization patterns, the microscope can be integrated in a time-resolved setup. Here a magnetic field pulse is used to excite a dynamic response of the micromagnetic ordering in the structures, which is in turn imaged by pulsed X-ray illumination from a synchrotron source. With this technique, precession dynamics and domain wall movements in polycristalline permalloy structures have already been successfully investigated. However, the timing requirements make it necessary to use single-bunch beam conditions for these experiments. Here, we present and compare two different approaches for fast switching of the imaging unit of the microscope in order to exploit the hybrid bunch in the normal injection pattern of Bessy II for time-resolved experiments