Abstract
A method for measuring the surface spin polarization using a spin-polarized metastable helium atom (He*) beam under high external magnetic fields has been developed. Recently, we have combined a spin-polarized He* beam generated using a hexapole magnet with a 5 T superconducting magnet. The apparatus has been used for studying the spin polarization of an Fe/MgO(100) surface oxidized at room temperature. A high negative spin polarization has been found at around the Fermi level when the surface was exposed to an excess amount of O2 gas (>100 L) at room temperature. This may be understood if assuming the formation of Fe3O4 on the surface.
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