10:30 AM - 10:45 AM
[11a-S224-1] Structure and spin polarization at Ge/Fe(100) interfaces analyzed by spin-polarized ion scattering spectroscopy
Keywords:Germanium, Spin polarization, Surface
In the present study, the very initial stage of Ge growth on an Fe(100) surface at room temperature (RT) and 633 K was investigated mainly by surface sensitive spin-polarized ion scattering spectroscopy. The incorporation of the deposited Ge into the Fe substrate occurs at 633 K while no interfacial reaction was observed at RT. The incorporation of Ge was followed by the long range super-structure formation on the surface which consists of a single Ge atomic layer. In the super-structure, the Ge atom is likely located at the hollow site of Fe(100), and thus, there are Fe atoms which are not coordinated to the Ge adatoms on the outermost surface. However, the surface spin polarization of Fe decreases with the Ge deposition more rapidly at 633 K than RT. The induced spin polarization in Ge is very small and it vanishes with the super-structure formation. Those results indicate the effective spin depolarization by the Fe(100) surface with the above-mentioned Ge super-structure.