Session 5-2

Abstract

In developing novel materials and improving their performance, it is essential to clarify the electronic states near the Fermi level, which directly contribute to the physical properties. Recently, there has been a growing need to measure local electronic states down to sub-micrometers. Spin-resolved photoemission spectroscopy is a powerful technique to investigate the spin-polarized electronic states in materials. However, the measurement efficiency of spin-resolved photoemission spectroscopy is extremely low compared to that of spin-integrated photoemission spectroscopy. We recently developed an imaging-type spin-resolved photoemission microscopy (iSPEM) with a multi-channel spin detector developed at the National Institute for Materials Science (NIMS) [1-3]. Thanks to the multi-channel spin detector, our iSPEM machine significantly reduces the data acquisition time in spin-resolved photoemission spectroscopy by ten thousand times compared with conventional machines using the single-channel spin detector. Besides, we have achieved the spatial resolution of 30 nm (420 nm) for spin-integrated (-resolved) photoemission imaging. We demonstrate the spin polarization imaging of polycrystalline iron with the real space mode and spin-resolved Fermi-surface imaging of Bi(111) in the momentum space mode.