Characterization of SPELEEM using multi-polarized soft x-rays at BL17SU/SPring-8

Guo, F.Z.; Saitoh, Y.; Muro, T.; Matsushita, T.; Wakita, T.; Ohashi, H.; Senba, Y.; Kinoshita, T.; Kobayashi, K.; Koshikawa, T.; Yasue, T.; Oura, M.; Takeuchi, T.; Shin, S. Japan

SPELEEM (Spectroscopic photoemission and low energy electron microscope) is installed at BL17SU (RIKEN/SPring-8). Soft x-rays are focused to the size 14 µm × 6 µm by two cylindrical mirrors in front of SPELEEM. Photon energies from 250 eV to 2000 eV are experimentally verified possible to be used to study light elements (C, N, O et al.), transition metals and rare earth metals. BL17SU employs multi-polarization mode Undulator, which is composed of electromagnet arrays and permanent magnet arrays. Horizontal or vertical linearly polarized light can be selected by sliding the permanent magnet arrays or changing the electromagnets phase, while left or right circularly polarized lights can be obtained by changing the polarity of the current in electromagnets. The novel characteristics of polarized lights are powerful in the study of magnetic materials, for example the detail studies of exchange bias and giant magnetic resistance, by using x-ray magnetic linear dichroism (XMLD) or magnetic circular dichroism (XMCD). We describe the installation of SPELEEM at BL17SU and report some experimental results.

---

back