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“Order – order” kinetics was studied by means of “in situ” and quasi-residual (REST) resistometry in bulk and thin films of  L1 0 -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 in  L1 0 -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  z- variant L1 0  superstructure into a mixture of  x-  and  y- variants.

Atomic migration and ordering phenomena in bulk and thin films of FePd and FePt