Monitoring surface resonances on Co2MnSi (100) by spin-resolved photoelectron spectroscopy
Monitoring surface resonances on Co2MnSi (100) by spin-resolved photoelectron spectroscopy
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DOI：
10.1103/physrevb.91.195128
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发表时间：
2015-03
影响因子：
3.7
通讯作者：
J. Braun;M. Jourdan;Alexander Kronenberg;S. Chadov;B. Balke;M. Kolbe;A. Gloskovskii;H. Elmers;G. Schönhense;C. Felser;M. Klaeui;H. Ebert;J. Minár
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文献类型：
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作者：
J. Braun;M. Jourdan;Alexander Kronenberg;S. Chadov;B. Balke;M. Kolbe;A. Gloskovskii;H. Elmers;G. Schönhense;C. Felser;M. Klaeui;H. Ebert;J. Minár
室温下铁磁材料费米能级处自旋极化的大小是自旋电子学的一个关键性质。研究Heusler化合物Co2 MnSi，在室温下观察到自旋极化的值为93，其中高自旋极化与延伸到体中的多数带中的稳定表面共振有关。特别是，我们确定在我们的光谱分析，这种表面共振是嵌入在大量的连续与大多数体状态的强耦合。共振表现得非常像块体，因为它在相应的（001）表面的前六个原子层上延伸。我们的研究包括实验研究，其中的体电子结构以及表面相关的功能进行了研究，使用自旋分辨光电子能谱（SR-UPS）和更大的探测深度自旋集成高能X射线光电子能谱（HAXPES）。与第一性原理能带结构和光电发射计算，考虑所有的相对论，表面和高能量的影响适当的结果进行了解释。
The magnitude of the spin polarization at the Fermi level of ferromagnetic materials at room temperature is a key property for spintronics. Investigating the Heusler compound Co$_2$MnSi a value of 93$\%$ for the spin polarization has been observed at room temperature, where the high spin polarization is related to a stable surface resonance in the majority band extending deep into the bulk. In particular, we identified in our spectroscopical analysis that this surface resonance is embedded in the bulk continuum with a strong coupling to the majority bulk states. The resonance behaves very bulk-like, as it extends over the first six atomic layers of the corresponding (001)-surface. Our study includes experimental investigations, where the bulk electronic structure as well as surface-related features have been investigated using spin-resolved photoelectron spectroscopy (SR-UPS) and for a larger probing depth spin-integrated high energy x-ray photoemission spectroscopy (HAXPES). The results are interpreted in comparison with first-principles band structure and photoemission calculations which consider all relativistic, surface and high-energy effects properly.