Electron-Spin Dependent Surface Scattering of a Polarized <sup>4</sup>He<sup>+</sup> Ion Beam

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  • SUZUKI Taku T.
    National Institute for Materials Science
  • SAKAI Osamu
    National Institute for Materials Science Comprehensive Research Organization for Science and Society

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Other Title
  • 偏極<sup>4</sup>He<sup>+</sup>イオンビームによるスピン依存イオン散乱とその応用
  • 偏極⁴He⁺イオンビームによるスピン依存イオン散乱とその応用
  • ヘンキョク ⁴ He ⁺ イオンビーム ニ ヨル スピン イソン イオン サンラン ト ソノ オウヨウ

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Abstract

<p>An electron-spin polarized 4He+ ion beam is useful for analyzing the spin polarization on outermost surfaces (spin-polarized ion scattering spectroscopy). This is because the neutralization of the He+ ion (the Auger neutralization) in the vicinity of the surface is dependent on the spin due to the Pauli principle. Thus, the element-selective spin polarization of the outermost surface is analyzed from the spin-dependent ion scattering (the spin asymmetry). We recently found that the spin asymmetry also appears on the surface of a non-magnetic material. The appearance of the spin asymmetry is quantitatively interpreted in terms of the anomalously large spin-orbit coupling (SOC) in the quantum mechanical intermediate state, where the SOC transiently acts on the spin of the virtually created hole in the target during the He+ ion-target atom binary collision.</p>

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 38 (4), 164-169, 2017

    The Surface Science Society of Japan

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