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XPS and XAS investigations of multilayer nanostructures based on the amorphous CoFeB alloy
Journal of Electron Spectroscopy and Related Phenomena ( IF 1.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.elspec.2020.146979
E.P. Domashevskaya , N.S. Builov , S.A. Ivkov , A.A. Guda , A.I. Chukavin , A.L. Trigub

Abstract We analyzed two amorphous multilayer nanostructures (MLNS) [(CoFeB)60C40/SiO2]200 and [(CoFeB)34(SiO2)66/C]46 with the same element composition, but with the inverse location of the non-metallic phases C and SiO2 in the metal-composite layers or interlayers. Based on the analysis of XPS and X-ray absorption spectra, it was found that in the metal-composite layers the chemical bonds prevailing at the interphase boundaries between the CoFeB metal clusters and the elements of the surrounding matrix, forming predominantly carbide or oxide phases depending on the C or SiO2 matrix composition. Quantitative fitting of the Fourier transforms for the Fourier transformed EXAFS signal from two MLNSs shows, that in [(CoFeB)60C40/SiO2]200 with carbon in metal-composite the Fe and Co atoms of metal clusters have coordination numbers comparable to each other (6.73 and 7.68). In another MLNS [(CoFeB)34(SiO2)66/C]46, in which carbon forms interlayers, and its place in metal-composite layers is taken by SiO2, the number of atoms in the nearest environment of Co (6.71) close to the previous one, and the number of atoms in the environment of iron atoms (3.37) most two times less and, rather, is typical for compounds of iron with oxygen from the composite matrix in this MLNS. This lead to noticeable violations of the planarity of the interface and the anisotropy of electromagnetic properties in this MLNS.

中文翻译:

基于非晶 CoFeB 合金的多层纳米结构的 XPS 和 XAS 研究

摘要 我们分析了两种具有相同元素组成但非金属相位置相反的非晶多层纳米结构 (MLNS) [(CoFeB)60C40/SiO2]200 和 [(CoFeB)34(SiO2)66/C]46金属复合层或夹层中的 C 和 SiO2。基于对 XPS 和 X 射线吸收光谱的分析,发现在金属复合层中,化学键在 CoFeB 金属簇与周围基体元素之间的相界面处占主导地位,主要形成碳化物或氧化物相取决于 C 或 SiO2 基体组成。来自两个 MLNS 的傅立叶变换 EXAFS 信号的傅立叶变换的定量拟合显示,在 [(CoFeB)60C40/SiO2]200 与金属复合物中的碳中,金属簇的 Fe 和 Co 原子的配位数彼此相当(6.73 和 7.68)。在另一个 MLNS [(CoFeB)34(SiO2)66/C]46 中,碳形成夹层,其在金属复合层中的位置被 SiO2 取代,Co (6.71) 最近环境中的原子数接近与前一个相比,铁原子 (3.37) 环境中的原子数最多减少两倍,相反,对于该 MLNS 中复合基质中铁与氧的化合物而言,这是典型的。这导致显着违反该 MLNS 中界面的平面性和电磁特性的各向异性。Co 最近环境中的原子数 (6.71) 接近前一个,而铁原子环境中的原子数 (3.37) 最多少两倍,而是铁与氧的化合物的典型这个 MLNS 中的复合矩阵。这导致显着违反该 MLNS 中界面的平面性和电磁特性的各向异性。Co 最近环境中的原子数 (6.71) 接近前一个,而铁原子环境中的原子数 (3.37) 最多少两倍,而是铁与氧的化合物的典型这个 MLNS 中的复合矩阵。这导致显着违反该 MLNS 中界面的平面性和电磁特性的各向异性。
更新日期:2020-08-01
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