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Harnessing electron spin is crucial in developing energy-saving andhigh-speed devices for the next generation. In this scheme, visualizingspin-polarized electronic states aids in designing and developing new materialsand devices. Spin-resolved photoemission spectroscopy provides information onthe spin-polarized electronic states. To investigate the spin-polarizedelectronic states in microscopic materials and devices, spin-resolvedphotoemission spectroscopy requires spatial resolution in a sub-micrometerscale. Here we show the imaging-type spin-resolved photoemission microscopy(iSPEM) with an ultraviolet laser developed at the National Institutes forMaterials Science (NIMS). Our iSPEM achieves a spatial resolution of 420 nm,drastically improving by more than an order of magnitude compared toconventional spin-resolved photoemission spectroscopy instruments. Besides, themulti-channel spin detector significantly reduces the data acquisition time byfour orders of magnitude compared to the conventional instruments. The iSPEMmachine elucidates the spin-polarized electronic states of sub-micrometer scalematerials, polycrystals, device structure samples, and so on, which have yet tobe the target of conventional spin-resolved photoemission spectroscopy.

Visualization of spin-polarized electronic states by imaging-type spin-resolved photoemission microscopy