Abstract <p>Magnetic films for the creating of magnetic field amplifiers must have a high magnetic permeability. The magnetization characteristics of electrochemically deposited Co–Ni–Fe films of variable composition are investigated at the nanometer scale using a magnetic force microscope. The difference in the magnetization of the samples is explained proceeding from peculiarities of their local domain and crystallographic structure. The high magnetic permeability in weak magnetic fields is supposed to be determined by the tremag alloy Co₆₀Ni₂₀Fe₂₀ crystal lattice, in which the fcc and bcc cells are neighboring each other.</p>