ossbauer spectra, one paramagnetic component (doublet) associated with the low-spin ∞-Fe‐Ni phase (∞LS), and a hyperfine magnetic field distribution associated with the Ni-rich fcc phase. The ∞LS phase is present throughout milling time except between 0 to 2 hours where the ferromagnetism increases. The magnetic behavior depends only on structural ordering of the samples. From the shape of the hyperfine magnetic field distributions was determined that the ferromagnetism increase when the structural order increases.