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Partyka, Ewa
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article
Atomic migration and ordering phenomena in bulk and thin films of FePd and FePt
Abstract
<jats:title>Abstract</jats:title><jats:p>“Order – order” kinetics was studied by means of “in situ” and quasi-residual (REST) resistometry in bulk and thin films ofL1<jats:sub>0</jats:sub>-ordered FePd and FePt intermetallics. Substantial effect of magnetic ordering on the activation energy for chemical ordering was revealed in FePd. A discontinuous change of ordering dynamics was detected in FePt between 800 and 830 K. The results are consistent with the data of Fe* diffusion in FePt multilayer examined by means of nuclear resonant scattering in grazing-incidence geometry (GINRS). Monte Carlo (MC) simulations of “order –order” processes inL1<jats:sub>0</jats:sub>-ordered bulk FePd and FePt and nano-layered FePt have been carried out using Glauber dynamics with vacancy mechanism of atomic jumps. Multi-timescale “order – order” relaxations observed in the bulk were predominated in nanolayers by a reorientation of the initial <jats:italic>z-</jats:italic>variant L1<jats:sub>0</jats:sub> superstructure into a mixture of <jats:italic>x-</jats:italic> and <jats:italic>y-</jats:italic>variants.</jats:p>