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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Surface electronic structure of fcc Co films: a combined spin-resolved one- and two-photon-photoemission study
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Surface electronic structure of fcc Co films: a combined spin-resolved one- and two-photon-photoemission study

机译：fcc Co膜的表面电子结构：自旋分辨的单光子和双光子光发射研究

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摘要

The surface electronic structure of face-centred-cubic cobalt films on Cu(0 0 1) was studied by spin-resolved one- and two-photon photoemission. A minority surface state in a Δ1-symmetry gap of the minority band-structure was identified at about 0.45 eV below the Fermi energy. This state causes a resonance-like enhancement in the population of the minority image-potential surface state in the two-photon-photoemission experiment excited by p-polarized light. Additionally, it appears as a surface-sensitive spectral feature in normal photoemission (PE) and its existence is confirmed by calculations within the one-step model of PE. The majority counterpart of the surface state is theoretically expected at a binding energy of about 1.95 eV. Due to lifetime broadening and bulk transitions in this energy range, the majority state does not appear as a pronounced feature in the spectra. Bulk-derived states close to the Fermi level exhibit shifts to higher binding energy with increasing film thickness, while the minority surface state does not change its energy as a function of Co coverage. These results provide a basis for the interpretation of time-resolved measurements concerning ultrafast magnetization dynamics, which rely on a detailed knowledge of the surface electronic structure of ultrathin films.
机译：通过自旋分辨单光子和双光子光发射研究了Cu（0 0 1）上面心立方钴膜的表面电子结构。少数能带结构的Δ1对称间隙中的少数表面态被确定为比费米能量低约0.45 eV。在由p偏振光激发的双光子光发射实验中，该状态引起少数像电位表面态的总体共振样增强。此外，它在常规光发射（PE）中表现为表面敏感光谱特征，并且通过在PE的一步模型中进行计算来确认其存在。从理论上讲，预期表面状态的大多数对应物的结合能约为1.95 eV。由于寿命变宽和在此能量范围内的体积跃迁，多数状态在光谱中并未表现为明显的特征。随着薄膜厚度的增加，接近费米能级的本体态表现出向更高结合能的转变，而少数表面态却不会随着Co覆盖率的变化而改变其能。这些结果为解释有关超快磁化动力学的时间分辨测量提供了基础，该测量依赖于对超薄膜表面电子结构的详细了解。

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