Electron-spin-dependent 4He+ ion scattering on Bi surfaces |
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Authors: | S Ichinokura T Hirahara O Sakai S Hasegawa |
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Institution: | 1. Department of Physics, University of Tokyo, 7-3-1 Hongo, bunkyo-ku, Tokyo 113-0033, Japan;2. Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;3. National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan |
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Abstract: | We studied low-energy (~ 1.55 keV) electron-spin-polarized 4He+ ion scattering on a Bi(111) ultrathin film epitaxially grown on a Si(111) substrate. We observed that the scattered ion intensity differed between the incident He+ ions with up and down spins even though Bi is a non-magnetic element. To analyze the origin of this spin-dependent ion scattering (the spin asymmetry), we investigated the detailed relationship between the spin asymmetry and the incident angle, the azimuthal angle, the scattering angle, and the incident energy. All the data indicate that the spin asymmetry originates from the scattering cross section owing to the non-central force in the He+–Bi atom binary collision. The non-central force is most likely attributed to the spin–orbit coupling that acts transiently on the He+ 1s electron spin in the binary collision. |
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Keywords: | low-energy ion scattering electron-spin spin–orbit coupling atomic collision |
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