Time-temperature-transformation diagrams for the A1 to L[1.sub.0] phase transformation in FePt and FeCuPt thin films

The kinetics of the A1 to L[I.sub.0] are provided in the form of time-temperature-transformation diagrams, which are calculated using the data for 1 [micro]m thick FePt and FeCuPt thin films and three variations of the Johnson-Mehl-Avrami-Kolmogorov kinetic theory. The transformation in nanoparticles is found to be highly dependent on the nucleation of the L[1.sub.0] phase.