Abstract

Time-of-flight in situ neutron reflectometry (i-NR) on Si/[⁵⁷Fe(x nm)/^natFe(x nm)]₄/Pt with x = 4 and 8 nm multilayers during consecutive heat treatments at 423, 448, 473 and 498 K reveal an unexpected rearrangement of free volumes and an interface smoothening in the isotopic Fe multilayer below 473 K, before the regime of regular Bragg intensity decay starts. The bilayer period dependence of the diffusivities at around 500 K, however, does not follow predictions of Harrison’s theory for the C-type regime representing grain boundary diffusion.

中文翻译：

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原位中子反射计在57 Fe / nat Fe多层膜中的自扩散

摘要

Si / [ ⁵⁷ Fe（x nm）/ ^nat Fe（x nm）] ₄ / Pt的飞行时间原位中子反射计（i -NR），在423处连续热处理期间，x = 4和8 nm 448、473和498 K揭示了在常规布拉格强度衰减开始之前，在473 K以下的同位素Fe多层膜中自由体积的意外重新排列和界面平滑。但是，在500 K左右，扩散率与双层周期的相关性并未遵循哈里森理论对代表晶界扩散的C型态的预测。