Atomic separation in Co/Cu/Co magnetic structures study by hybrid X-ray reflectivity – X-ray standing wave approach

Kondratev, O. A.; Makhotkin, Igor A.; Yakunin, S. N.

doi:10.1016/j.apsusc.2021.151573

Cited by 7 publications

(7 citation statements)

References 31 publications

(36 reference statements)

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“…The corresponding parameters of concentration are indexed similarly and the interfaces are chosen to be at the top of the corresponding layer. A prominent feature of this sample is that the optical contrast between Co and Cu in the hard X-ray range is very small, so it becomes challenging to distinguish parameters in between layers of these materials (Kondratev et al, 2022). In particular, this is one of the reasons which necessitates the use of elementspecific reconstruction for such a sample.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we assume that these discrepancies are due to the fixed model of the profiles [see equation ( 8)]. For instance, GIXRF data from the same sample were analysed using the free-form approach, which yielded a better fit to the data (Kondratev et al, 2022). However, in this study, we are focusing on a statistical analysis of the sensitivity of both methods, so we are bound to the model-based structure reconstruction.…”

Section: Resultsmentioning

confidence: 99%

“…This is especially prominent for the thickness of the Cu layer (d Cu ), 11.19% for GIXRF versus 5.97% for GEXRF. As described by Kondratev et al (2022), it is especially challenging to reconstruct the parameters of the Cu layer due to the low optical contrast with Co. And yet, GEXRF reconstruction is twice as precise as GIXRF.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the Ta/ Co/Cu/Co/Ta structure is a good showcase to demonstrate the ability of angle-resolved XRF to distinguish the concentration profiles of different species. Previously we studied this sample by means of GIXRF (Kondratev et al, 2022).…”

Section: Experimental and Data Analysis Detailsmentioning

confidence: 99%

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Grazing-emission X-ray fluorescence as a multiprobe tool for thin-film metrology

Nikolaev,

Safonov,

Kondratev

et al. 2023

J Appl Crystallogr

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Recent research has demonstrated the high potential of grazing-emission X-ray fluorescence as a nanometrology tool for structures with complex 3D architecture. The technique now allows separate reconstruction of the spatial atomic distributions of different chemical elements both vertically and laterally, which opens up new and interesting applications in the nanofabrication industry. This study compares grazing-emission fluorescence with the well established grazing-incidence X-ray fluorescence method. The comparison uses a simple 1D thin-film structure. Reconstruction of the structure by both methods is performed and the statistical uncertainties of these reconstructions are compared by means of Monte Carlo Markov-chain simulations. For the forward model a semi-analytic approach is derived which allows simulation of the fluorescence intensity. This approach takes into account both grazing-incidence and grazing-emission cases. It also accounts for an even more complex physical phenomenon, the anomalous Kossel effect. Finally, using this semi-analytic approach, an experimental scheme combining grazing-incidence and grazing-emission X-ray fluorescence is studied theoretically.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental and Data Analysis Detailsmentioning

confidence: 99%

See 2 more Smart Citations

Grazing-emission X-ray fluorescence as a multiprobe tool for thin-film metrology

Nikolaev,

Safonov,

Kondratev

et al. 2023

J Appl Crystallogr

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“…The experimental XRR and XRF data were analyzed using the hybrid free-form approach (Kondratev et al, 2022;Novikova et al, 2023), enabling precise reconstruction of the electron density profile without the need for any prior assumptions about the layered structure. In the classical approach to fitting experimental XRR data, the sample is represented as a planar layered structure, with each layer having parameters such as thickness, optical constant and inter-layer (interface) thickness (Windt, 1998).…”

Section: Sample Characterizationmentioning

confidence: 99%

X-ray standing wave characterization of the strong metal–support interaction in Co/TiO_x model catalysts

Tiwari,

Monai,

Matveevskii

et al. 2024

J Appl Crystallogr

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The strong metal–support interaction (SMSI) is a phenomenon observed in supported metal catalyst systems in which reducible metal oxide supports can form overlayers over the surface of active metal nanoparticles (NPs) under a hydrogen (H2) environment at elevated temperatures. SMSI has been shown to affect catalyst performance in many reactions by changing the type and number of active sites on the catalyst surface. Laboratory methods for the analysis of SMSI at the nanoparticle-ensemble level are lacking and mostly based on indirect evidence, such as gas chemisorption. Here, we demonstrate the possibility to detect and characterize SMSIs in Co/TiO x model catalysts using the laboratory X-ray standing wave (XSW) technique for a large ensemble of NPs at the bulk scale. We designed a thermally stable MoN x /SiN x periodic multilayer to retain XSW generation after reduction with H2 gas at 600°C. The model catalyst system was synthesized here by deposition of a thin TiO x layer on top of the periodic multilayer, followed by Co NP deposition via spare ablation. A partial encapsulation of Co NPs by TiO x was identified by analyzing the change in Ti atomic distribution. This novel methodological approach can be extended to observe surface restructuring of model catalysts in situ at high temperature (up to 1000°C) and pressure (≤3 mbar), and can also be relevant for fundamental studies in the thermal stability of membranes, as well as metallurgy.

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Quantification of lithium using handheld instruments: application of LIBS and XRF spectroscopy to assay the lithium content of mineral processing products

Korbel,

Mezoued,

Demeusy

et al. 2024

J. Anal. At. Spectrom.

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Atomic separation in Co/Cu/Co magnetic structures study by hybrid X-ray reflectivity – X-ray standing wave approach

Cited by 7 publications

References 31 publications

Grazing-emission X-ray fluorescence as a multiprobe tool for thin-film metrology

Grazing-emission X-ray fluorescence as a multiprobe tool for thin-film metrology

X-ray standing wave characterization of the strong metal–support interaction in Co/TiO_x model catalysts

Quantification of lithium using handheld instruments: application of LIBS and XRF spectroscopy to assay the lithium content of mineral processing products

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Atomic separation in Co/Cu/Co magnetic structures study by hybrid X-ray reflectivity – X-ray standing wave approach

Cited by 7 publications

References 31 publications

Grazing-emission X-ray fluorescence as a multiprobe tool for thin-film metrology

Grazing-emission X-ray fluorescence as a multiprobe tool for thin-film metrology

X-ray standing wave characterization of the strong metal–support interaction in Co/TiO x model catalysts

Quantification of lithium using handheld instruments: application of LIBS and XRF spectroscopy to assay the lithium content of mineral processing products

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Product

Resources

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X-ray standing wave characterization of the strong metal–support interaction in Co/TiO_x model catalysts