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The capability of high-pressure torsion on the preparation of supersaturatedsolid solutions, consisting of Cu-14Fe (wt.%), is studied. From microstructuralinvestigations a steady state is obtained with nanocrystalline grains. Theas-deformed state is analyzed with atom probe tomography, revealing an enhancedsolubility and the presence of Fe-rich particles. The DC-hysteresis loop showssuppressed long range interactions in the as-deformed state and evolves towardsa typical bulk hysteresis loop when annealed at 500{\deg}C. AC-susceptometrymeasurements of the as-deformed state reveal the presence of asuperparamagnetic blocking peak, as well as a magnetic frustrated phase,whereas the transition of the latter follows the Almeida-Thouless line,coinciding with the microstructural investigations by atom probe tomography.AC-susceptometry shows that the frustrated state vanishes for annealing at250{\deg}C.

Intermixing of Fe and Cu on the atomic scale by high-pressure torsion as revealed by DC- and AC-SQUID susceptometry and atom probe tomography