标题： 极性FeO(111)薄膜在MgO(111)上的逐层外延生长 显示英文标题

标题： Layer-by-layer epitaxial growth of polar FeO(111) thin films on MgO(111)

摘要： 我们报告了在 MgO(111) 上通过分子束外延生长的外延 FeO 层的结构特性。 成功稳定了极性 FeO 薄膜，其厚度可达 16 单层 (ML)，该薄膜通过单层 Fe 层的沉积和随后的氧化获得。 FeO/MgO(111) 薄膜通过低能电子衍射、俄歇电子能谱和转换电子莫斯鲍尔谱 (CEMS) 进行了化学和结构表征。 随薄膜厚度变化的原位 CEMS 测量详细显示了由于尺寸效应引起的超精细参数演变，最厚的薄膜表现出体磁铁矿的超精细图案。 原位 CEMS 研究确认了磁铁矿薄层相在液氮温度下的磁序。 显示英文摘要

摘要： We report on the structural properties of epitaxial FeO layers grown by molecular beam epitaxy on MgO(111). The successful stabilization of polar FeO films as thick as 16 monolayers (ML), obtained by deposition and subsequent oxidation of single Fe layers, is presented. FeO/MgO(111) thin films were chemically and structurally characterized using low-energy electron diffraction, Auger electron spectroscopy and conversion electron Mossbauer spectroscopy (CEMS). Detailed in situ CEMS measurements as a function of the film thickness demonstrated a size-effect-induced evolution of the hyperfine parameters, with the thickest film exhibiting the bulk-wustite hyperfine pattern. Ex situ CEMS investigation confirmed the magnetic ordering of the wustite thin film phase at liquid nitrogen temperature.