  The capability of high-pressure torsion on the preparation of supersaturated
solid solutions, consisting of Cu-14Fe (wt.%), is studied. From microstructural
investigations a steady state is obtained with nanocrystalline grains. The
as-deformed state is analyzed with atom probe tomography, revealing an enhanced
solubility and the presence of Fe-rich particles. The DC-hysteresis loop shows
suppressed long range interactions in the as-deformed state and evolves towards
a typical bulk hysteresis loop when annealed at 500{\deg}C. AC-susceptometry
measurements of the as-deformed state reveal the presence of a
superparamagnetic 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 at
250{\deg}C.
