Nano-metric self-diffusion of Fe: effect of grain size

Gong, Jing; Paul, Neelima; Nagy, Brigitta; Dolgos, Miklós; Bottyán, L.; Böni, P.; Paul, Amitesh

doi:10.1039/c6ra28310a

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…In a work by Tayal et al, such diffusion process was studied in nanocrystalline FeN thin film and a dominant grain boundary (gb) diffusion was observed for Fe atoms below 525 K. 39 However, it is proposed that the gb diffusion can be controlled by reducing gb defects in the various metallic as well as metal-metalloid systems. [44][45][46] Therefore, in order to understand the role of defects on the selfdiffuison of Fe and N, we performed SIMS depth profiling measurements on samples A and B, respectively, both below and above phase decomposition temperature.…”

Section: Resultsmentioning

confidence: 99%

Self-diffusion processes in stoichiometric iron mononitride

Tayal

Pandey

Reddy

et al. 2021

Journal of Applied Physics

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In this work, we studied atomic self-diffusion and structural phase transformation in a single phase iron mononitride (FeN) thin film deposited at an optimized substrate temperature (T s ) of 423 K. At this T s , FeN film exhibit a tetrahedral coordination between Fe and N atoms (ZnS-type structure with lattice parameter of 4.28Å). The structure of FeN film was studied by combining x-ray diffraction with Fe and N K-edge x-ray absorption spectroscopy and conversion electron Mössbauer spectroscopy measurements. Selfdiffusion of Fe and N was measured using secondary ion mass spectroscopy depth profiling in trilayer structures: [FeN(50 nm)/ 57 FeN(2 nm)/FeN(50 nm)] and [FeN(50 nm)/Fe 15 N(2 nm)/FeN(50 nm)] deposited on an amorphous quartz substrate using reactive magnetron sputtering. It was found that atomic self-diffusion is strongly associated with the thermal stability. Before reaching the phase decomposition temperature, the self-diffusion of N was found to be slower than Fe. Upon phase decomposition, both Fe and N diffuse rapidly, and at this stage, the self-diffusion of N takes over Fe. Within the thermally stable state, slower N diffusion indicates that Fe-N bonds are stronger than Fe-Fe bonds in FeN. This behavior was predicted theoretically and has been evidenced in this work.

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Section: Resultsmentioning

confidence: 99%

Self-diffusion processes in stoichiometric iron mononitride

Tayal

Pandey

Reddy

et al. 2021

Journal of Applied Physics

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“…To study interdiffusion processes in a layered structure a reflectometry technique (X-ray or neutron) can be used [25][26][27]. In this method a reflectivity curve R(Q) is measured as a function of momentum transfer Q = 4π sin(θ)/λ.…”

Section: B Reflectometry Data Analysismentioning

confidence: 99%

Proximity effect in [Nb(1.5nm)/Fe(x)]$_{10}$/Nb(50nm) superconducting/ferromagnet heterostructures

Khaydukov,

Pütter,

Guasco

et al. 2019

Preprint

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We have investigated the structural, magnetic and superconducting properties of [Nb(1.5nm)/Fe(x)]10 superlattices deposited on a thick Nb(50nm) layer.Our investigation showed that the Nb(50nm) layer grows epitaxially at 800 • C on Al2O3(1 102) substrate. Samples grown at this condition posses a high residual resistivity ratio of 15-20. By using neutron reflectometry we show that Fe/Nb superlattices with x < 4 nm form a depth-modulated FeNb alloy with concentration of iron varying between 60% and 90%. This alloy has properties of a weak ferromagnet. Proximity of this weak ferromagnetic layer to a thick superconductor leads to an intermediate phase that is characterized by co-existing superconducting and normal-state domains. By increasing the thickness of the Fe layer to x = 4 nm the intermediate phase disappears. We attribute the intermediate state to proximity induced non-homogeneous superconductivity in the periodic Fe/Nb structure.

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