Electron Spin Polarization at Ferromagnetic Single Crystalline Nickel Surfaces Determined through Electron Capture by Scattered Deuterons
A beam of 150 keV deuterons is scattered at grazing incidence on a nickel single crystal surface (hkl) placed in a magnetic field. Polarized electrons captured by the scattered deuterons can orient the deuteron nuclei via the hyperfine interaction. Their polarization is then a measure of the original electron polarization and is determined from the angular distribution of the alpha-particles emitted in a T(d,n)4He reaction.
The electron spin polarization is found to be parallel to the magnetizing field in the nickel at (100) , (110) , (111) , and (111) , antiparallel in (120) . The symbols in the brackets indicate the beam direction, the magnetization being in the plane and perpendicular to the beam direction. An electron spin polarization of (96.1±2.8)% is found at the (110) surface, other surfaces giving as yet lower values.
KeywordsSpin Polarization Nickel Surface Electron Spin Polarization Target Chamber Pole Piece
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