Total reflection γ-ray resonant spectra of a Cr/Fe/Cr/MgO thin film in which a ⁵⁷Fe monolayer was embedded at a depth of 6 nm below the surface were studied using a synchrotron Mössbauer source. Due to an interference between electron and nuclear resonant scatterings, the spectra showed asymmetric absorption and scattering profiles depending on beam incidence angles. The spectra were reproduced via theoretical simulations based on an anomalous scattering factor associated with nuclear resonance. The origin of the asymmetric spectral profiles was explained by a change in the phase factor of nuclear resonant scattering amplitude at the ⁵⁷Fe enriched monolayer. These results pave the way for advanced local magnetic analyses on the deeply buried interface of functional magnetic thin films and direct phase determination of γ-rays in thin films.

中文翻译：

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来自嵌入薄膜中的 57Fe 单层的全反射穆斯堡尔 γ 射线的量子干涉

使用同步加速器穆斯堡尔源研究了 Cr/Fe/Cr/MgO 薄膜的全反射γ射线共振光谱，其中⁵⁷ Fe 单层嵌入表面以下 6 nm 的深度。由于电子和核共振散射之间的干扰，光谱显示出取决于光束入射角的不对称吸收和散射分布。光谱是通过基于与核共振相关的异常散射因子的理论模拟再现的。不对称光谱分布的起源可以通过核共振散射振幅在⁵⁷度处的相位因子的变化来解释。Fe 富集的单层。这些结果为功能磁性薄膜的深埋界面的高级局部磁分析和薄膜中γ射线的直接相位测定铺平了道路。