High-quality Fe(001) single crystal films on MgO(001) substrates for electron spectroscopies
High-quality Fe(001) single crystal films on MgO(001) substrates for electron spectroscopies
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用于电子光谱的 MgO(001) 基底上的高质量 Fe(001) 单晶薄膜
DOI：
10.1116/1.581340
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
F. Ciccacci
中科院分区：
文献类型：
--
作者：
R. Bertacco;S. Rossi;F. Ciccacci
通过在 MgO(001) 衬底上外延生长，在超高真空中制备了 Fe 薄膜。自旋分辨逆光电发射测量表明，未退火的覆盖层显示出比相应的本体系统更低的光谱质量。低能电子衍射和 X 射线光电子发射表明，退火会促进氧表面偏析，即使在数百埃厚的薄膜中也能产生 c(2×2) 重构。研究发现，相对较厚的薄膜（>1000 A）经过高温退火（~600 ℃）后可以获得表面洁净、有序的高质量Fe(001)单晶薄膜。
Fe films have been prepared in ultrahigh vacuum by epitaxial growth on MgO(001) substrates. Spin-resolved inverse photoemission measurements indicate that nonannealed overlayers display lower spectroscopic quality than the corresponding bulk system. Low energy electron diffraction and x-ray photoemission reveal that annealing promotes oxygen surface segregation giving rise to a c(2×2) reconstruction even in several hundred A thick films. It is found that high-quality Fe(001) single crystal films with clean and well ordered surfaces can be obtained after high temperature annealing (∼600 °C) of relatively thick films (>1000 A).