Abstract
We developed a Mott analyzer of the spherical accelerator type, to measure the spin polarization of electrons extracted from a ferro-magnetic tip or a GaAs sample. This analyzer was designed for a low-acceleration voltage (40 kV). Inelastic scattered electrons are retarded by spherical electrodes. This paper reports on the spin polarization of electrons extracted from negative-electron affinity (NEA) GaAs. This type of Mott analyzer was found to have a few problems which require resolution.
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