“Order-order” kinetics in L1₀-ordered FePt nano-layers have been studied by Monte Carlo (MC) simulation implemented with Glauber dynamics and vacancy atomic-jump mechanism. In the presented preliminary approach the effects of the substrate character and of the tetragonal distorsion of the superstructure were neglected. Atomic pair-interaction energies in two co-ordination shells were evaluated on the basis of Cluster-Expansion “ab-initio” calculations carried out for Fe-Pt binary system. Nano-layers limited by two (001)-type free surfaces were simulated by imposing two-dimensional (x-y) periodic boundary conditions upon a sample of FePt with different variants of L1₀ superlattice (different orientations of monoatomic planes). Selective effect of free surfaces on the stability of L1₀ variants was observed. While no effect was detected in the case of the variants with (100)- and (010)-type Fe and Pt planes (x- and y- L1₀ variants, respectively), the L1_0­ stability was strongly reduced in the case of z- L1₀ variant ((001)-type monoatomic planes). As a result, the initially homogeneous FePt films ordered in z- L1₀ variant showed a complex “order-order” process resulting in a microstructure of x- and y- L1₀ variant domains. Kinetics of the process was analysed in atomistic scale.

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