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Springer series in solid-state sciences

Spin-Polarized Atomic Beam as a Probe of Spin Correlation at the Topmost Layer of Surfaces

E. Torikai, Hirokazu Hori

Published Jan 1, 1996• 2 citations
Publisher
DOI
10.1007/978-3-642-61185-8_13

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A spin-polarized triplet metastable helium (He*) beam has been used as a probe for surface magnetism, but changes in the spin state during scattering from a surface remain unclear. In the present study, we explored this issue by constructing an apparatus that allows us to direct a spin-polarized He* beam to a surface and measure the spin polarization of He* scattered from the surface. Magnetic hexapoles were used for both the beam polarization and the spin analysis. The results of the spin-dependent He* scattering experiments on clean Fe3O4{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}Fe3​O4​(100), H-terminated Fe3O4{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}Fe3​O4​(100), benzene-adsorbed Fe3O4{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}Fe3​O4​(100), and nonmagnetic Cu(100) surfaces indicated that, although the spin direction of He* was mostly preserved during scattering from these surfaces, spin-flop scattering of surviving He* occurred with a probability up to approximately 0.1. Our results showed that the survival probability was higher when the spins of He* and the Fe3O4{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}Fe3​O4​(100) film were parallel, which can be understood based on the lower He* resonance ionization rate for this spin orientation. Based on our findings, we estimate that a nonpolarized He* gas becomes 10% spin-polarized after a single collision with a clean Fe3O4{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}Fe3​O4​(100) surface.