铁（001）上外延氧化镁薄膜的自旋相关量子干涉
Spin-dependent quantum interference from epitaxial MgO thin films on Fe(001).
作者信息
Wu Y Z, Schmid A K, Qiu Z Q
机构信息
Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China.
出版信息
Phys Rev Lett. 2006 Nov 24;97(21):217205. doi: 10.1103/PhysRevLett.97.217205. Epub 2006 Nov 21.
Spin-dependent electron reflection from MgO thin films grown on Fe(001) was measured using spin-polarized low energy electron microscopy. The electron reflectivity exhibits quantum interference from which two MgO energy bands with Delta1 symmetry were determined in experiment. We found that a bulklike MgO energy gap is fully established for MgO film thicker than 3 atomic monolayers and that the electron reflectivity from the MgO/Fe interface exhibits a spin-dependent amplitude and a spin-independent phase change.
利用自旋极化低能电子显微镜测量了在Fe(001)上生长的MgO薄膜的自旋相关电子反射。电子反射率呈现出量子干涉现象，通过实验确定了具有Δ1对称性的两个MgO能带。我们发现，对于厚度超过3个原子单层的MgO薄膜，类似体相的MgO能隙已完全形成，并且MgO/Fe界面的电子反射率呈现出自旋相关的振幅和与自旋无关的相位变化。
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