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Surface studies using spin-polarized electron energy loss spectroscopy.

机译:使用自旋极化电子能量损失谱的表面研究。

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摘要

Spin-polarized electron energy loss spectroscopy (SPEELS) has been used to investigate several paramagnetic surfaces. In this technique, a low energy beam of spin-polarized electrons from a GaAs source is directed at the surface to be studied and the spin-polarization of the emitted electrons, as well as the kinetic energy distribution, is measured via a micro-Mott polarimeter equipped with a retarding potential energy analyzer. The near-elastic-energy electrons contain information on the inelastic scattering channels available in the solid. The spin-polarization of these same electrons is sensitive to the shape of the final state manifold, i.e., the density of unoccupied states. The low energy and behavior of the spin-polarization spectrum mainly reflects the high number of unpolarized electrons present near zero kinetic energy. Results from Cu(100), polycrystalline Au, GaAs(110), GaAs(100) and Mo(110) surfaces suggest that exchange scattering with spin-flip is ubiquitous for the lowest energy electron beam energies studied (
机译:自旋极化电子能量损失谱(SPEELS)已用于研究几个顺磁表面。在这项技术中,来自GaAs源的自旋极化电子的低能束直接对准要研究的表面,并通过micro-Mott测量发射电子的自旋极化以及动能分布配备了势能分析仪的旋光仪。接近弹性能量的电子包含有关固体中可用的非弹性散射通道的信息。这些相同电子的自旋极化对最终状态流形的形状(即未占据状态的密度)敏感。自旋极化谱的低能量和行为主要反映了存在于零动能附近的大量非极化电子。 Cu(100),多晶Au,GaAs(110),GaAs(100)和Mo(110)表面的结果表明,自旋翻转的交换散射在研究的最低能量电子束能量中无处不在(

著录项

  • 作者

    Mulhollan, Gregory Anthony.;

  • 作者单位

    Rice University.;

  • 授予单位 Rice University.;
  • 学科 Condensed matter physics.
  • 学位 Ph.D.
  • 年度 1990
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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