Sujoy Chakravarty

Fe and N self-diffusion in amorphous FeN: A SIMS and neutron reflectivity study

Abstract Simultaneous self-diffusion measurements of Fe and N in amorphous Fe 86 N 14 alloy using secondary ion mass spectroscopy (SIMS) are reported. In addition, neutron reflectivity (NR) was used to study the Fe self-diffusion in the same compound. The broadening of a tracer layer of 57 Fe 86 15 N 14 sandwiched between Fe 86 N 14 layers was observed by SIMS measurements after the annealing of films at different temperatures. A decay of the Bragg peak intensity after isothermal annealing was also observed in [ Fe 86 N 14 / 57 Fe 86 N 14 ] 10 multilayers in NR. It was observed by SIMS measurements that Fe diffusion was about 2 orders of magnitude smaller than N, even though the structural relaxation times for Fe and N were almost identical. This is an important result, indicating that the relaxation time of diffusion is basically driven by the relaxation of the structure itself.

Iron self-diffusion in Fe Zr ∕ Fe 57 Zr multilayers measured by neutron reflectometry: Effect of applied compressive stress

Iron self-diffusion in nanocomposite FeZr alloy has been investigated using a neutron reflectometry technique as a function of applied compressive stress. A composite target of

Iron Self-Diffusion in Chemically Homogeneous Multilayers

\mathrm{Fe}+\mathrm{Zr}

Structural Re-Organization Kinetics of Nanocrystalline Pt Films during In Situ Annealing

and

Self-Diffusion in Magnetron-Sputtered Nanocrystalline Fe Films

^{57}\mathrm{Fe}+\mathrm{Zr}

Self-Diffusion in Chemically Homogeneous Multilayers Using Neutron and Nuclear Resonance Reflectivity

was alternatively sputtered to deposit chemically homogeneous multilayer (CHM) structure

Strain relaxation and vacancy creation in thin platinum films.

{[^{\mathit{\text{natural}}}\mathrm{Fe}_{75}{\mathrm{Zr}}_{25}∕^{57}\mathrm{Fe}_{57}{\mathrm{Zr}}_{25}]}_{10}

Fe diffusion in amorphous and nanocrystalline alloys studied using nuclear resonance reflectivity

. The multilayers were deposited onto a bent Si wafer using a three-point bending device. Post-deposition, the bending of the substrate was released which results in an applied compressive stress on to the multilayer. In the as-deposited state, the alloy multilayer forms an amorphous phase, which crystallizes into a nanocomposite phase when heated at

Determination of volume self-diffusivities in ultrafine-grained metals using neutron reflectometry

373\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Self-diffusion and defect annihilation in nanocrystalline Fe films probed by neutron reflectometry

. Bragg peaks due to isotopic contrast were observed from CHM, when measured by neutron reflectivity, while x-ray reflectivity showed a pattern corresponding to a single layer. Self-diffusion of iron was measured with the decay of the intensities at the Bragg peaks in the neutron reflectivity pattern after thermal annealing at different temperatures. It was found that the self-diffusion of iron slows down with an increase in the strength of applied compressive stress.