Broadening of a neutron beam during its passage through a ferromagnetic phase with domains is of a refractive nature, and it can be suppressed by the application of a magnetic field. This effect was used to develop a pulsed neutron-refraction method for determining the time characteristics of the magnetization and switching processes. The dynamics of changes in the internal domain structure was determined by recording the time dependences of the neutron transmission after the action of a magnetic field pulse on a ferromagnet (silicon iron) placed between crystals in a two-crystal spectrometer. The results obtained revealed the occurrence of two processes, which could be identified with the magnetization by displacement of domain walls and rotation of the domain induction vectors.