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首页> 外文期刊>Physical review >Appearance of the minority d_z~2 surface state and disappearance of the image-potential state: Criteria for clean Fe(001)
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Appearance of the minority d_z~2 surface state and disappearance of the image-potential state: Criteria for clean Fe(001)

机译：少数d_z〜2表面状态的出现和图像电位状态的消失：清洁Fe（001）的标准

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The unoccupied surface electronic structure of clean and oxidized Fe(001) was studied with spin-resolved inverse photoemission and target current spectroscopy. For the clean surface, we detected a d_z~2 surface state with minority spin character just above the Fermi level, while the image-potential surface state disappears. The opposite is observed for the ordered p(1 × 1)O/Fe(001) surface: the d_z~2-type surface state is quenched, while the image-potential state shows up as a pronounced feature. This behavior indicates enhanced surface reflectivity at the oxidized surface. The appearance and disappearance of specific unoccupied surface states prove to be decisive criteria for a clean Fe(001) surface. In addition, enhanced spin asymmetry in the unoccupied states is observed for the oxidized surface. Our results have implications for the use of clean and oxidized Fe(001) films as spin-polarization detectors.
机译：用自旋分辨的反向光发射和目标电流光谱研究了干净和氧化的Fe（001）的未占据的表面电子结构。对于干净的表面，我们检测到了具有少数自旋特性的d_z〜2表面状态，其自旋刚好在费米能级以上，而图像电位表面状态消失了。对于有序的p（1×1）O / Fe（001）表面，观察到相反的情况：d_z〜2型表面态被淬灭，而图像势态则表现为明显的特征。此行为表明在氧化表面的表面反射率增强。特定的未占据表面状态的出现和消失被证明是清洁Fe（001）表面的决定性标准。另外，对于氧化的表面，在未占据状态下观察到增强的自旋不对称性。我们的结果对使用清洁氧化的Fe（001）薄膜作为自旋极化检测器有影响。

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