  Using a combination of numerical simulations and atom-probe tomography
experiments, we determine the interfacial energy of Cu nanocrystals
precipitated within the amorphous matrix of FINEMET (molar composition
Fe72.89Si16.21B6.90Nb3Cu1). Specifically, we use the Langer-Schwartz model
implemented in the software Thermocalc to carry out parametric simulations of
growth and coarsening of Cu clusters for different interface energies. We have
carried out atom-probe tomography (APT) experiments to determine the interface
energy as the value for which the simulated particle size distribution best
matches the experimental data. This combination of APT and precipitation
modeling can be applied to other nanocrystals precipitated within amorphous
matrices.
