Crystal perfection by strain engineering: The case of Fe/V (001)

Droulias, Sotirios A.; Pálsson, Gunnar K.; Palonen, Heikki; Arslanoğlu, Hasan; Leifer, Klaus; Kapaklis, Vassilios; Hjörvarsson, Bjørgvin; Wolff, Max

doi:10.1016/j.tsf.2017.07.005

Cited by 17 publications

(15 citation statements)

References 22 publications

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“…1 is a sketch of the sample design. A full description of the growth parameters and the structural analysis can be found elsewhere (Droulias et al, 2017). In brief, the superlattice grows epitaxially on an MgO substrate and is capped by a Pd layer for protection against oxidation and to facilitate the deuterium uptake.…”

Section: Methodsmentioning

confidence: 99%

Limitations of the kinematic approximation in neutron reflectivity measurements for the analysis of bilayers

et al. 2018

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The limitations of a phenomenological fitting approach compared to simulations of the optical model including reflection and refraction at all interfaces are demonstrated using the example of hydrogen loading in ultra‐thin vanadium layers. Fe/V superlattices are loaded with deuterium and the lattice expansion and deuterium concentration are extracted from neutron reflectivity data. A noticeable difference is found between the extraction of concentrations and bilayer thicknesses directly from the superlattice peaks and fits of the density profile using the Parratt formalism. The results underline the importance of carefully considering the limitations of phenomenological approaches, in order to obtain robust results. The limitations of the kinematic approximation for the analysis are discussed in detail.

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Section: Methodsmentioning

confidence: 99%

Limitations of the kinematic approximation in neutron reflectivity measurements for the analysis of bilayers

et al. 2018

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“…Furthermore, the crystalline quality and interface sharpness of metallic superlattices can be maintained for different thicknesses of the layers, when the strain state is the same. This can for example be achieved by keeping the thickness ratio of the layers (L L A B ) constant, as illustrated by a number of authors [6,7]. We also note that these superlattices can be loaded and unloaded hundreds of times without any structural degradation [8], and we can therefore exclude irreversible influences from grain boundaries and microstructure.…”

Section: Introductionmentioning

confidence: 91%

“…The single crystal n Fe V 2, 3, 4 n n 7 = ( )superlattices used for the study were grown on MgO (001) substrate with magnetron sputtering as described in [5,6,22]. The purity of the V and Fe targets is 99.95% and the size of the MgO (001) substrate is 1×1×0.1 cm 3 .…”

Section: Experimental Details 21 Sample Preparationmentioning

confidence: 99%

“…A schematic illustration of the similar superlattices can be found in [23]. They were characterised by x-ray reflectivity and diffraction as described in [6,8]. Briefly they are fully coherent throughout the total thickness of the samples and with an in-plane coherence length of several hundred nm [6].…”

Section: Experimental Details 21 Sample Preparationmentioning

confidence: 99%

“…Therefore, it is of large value to have access to model systems, where all but one identified contribution can be kept constant. This can be achieved by the use of single-crystal metallic superlattices which can be grown with a high structural quality and controllable strain state [5,6]. Furthermore, the crystalline quality and interface sharpness of metallic superlattices can be maintained for different thicknesses of the layers, when the strain state is the same.…”

Section: Introductionmentioning

confidence: 99%

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Finite size effects: deuterium diffusion in nm thick vanadium layers

et al. 2017

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We investigate the effect of finite size on the chemical diffusion of deuterium in extremely thin V(001) layers. A five fold increase in the diffusion coefficient is observed at concentrations around 0.2 [D/V], when the thickness of the V is decreased from 28 to 14 atomic layers (≈2.1-4.2 nm). The size dependent deuterium-deuterium interaction energy is argued to be the root of the observed changes as the diffusion rates are similar at low concentrations. The results demonstrate the feasibility of using finite-size effects to enhance the chemical diffusion of light interstitials in solids. We discuss the general applicability of these effects to other systems.

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