Short-range order in quasi-binary system $\mathrm{Cu_{79}Ni_{14}Fe_7}$ after annealing

This article investigates transformation of the local environment of iron atoms in quasi-binary system $\mathrm{Cu_{79}Ni_{14}Fe_7}$ after a short-term treatment ($\sim10^{-4}$ s) of the material by incoherent radiation from a powerful electric discharge in air. Irradiation causes a significant change in the ratio of the number of elementary clusters towards the increase of iron and nickel atoms in the nearest neighborhood of iron atoms without formation of appreciable quantities of oxides on the metal surface. At temperatures below 80 K, the alloy becomes magnetically ordered with the fast (compared to the excited-state lifetime of $^{57}\mathrm{Fe}$) dynamics of the magnetic subsystem. As the temperature lowers, the spectra show percolation process with the transition to a macro-spin glass state.