Magnetooptical Effects and Auger Electron Spectroscopy of Two-Layer NiFe-Dy and Fe-Dy Films with Nonuniform Layers

摘要

Magnetooptical effects (magnetic circular dichroism and longitudinal Kerr effect) and the in-depth distribution of elements in two -layer NiFe-Dy and Fe-Dy films obtained by thermal deposition of the components in an ultrahigh vacuum have been studied. It is shown that in a temperature range of 80-300 K dysprosium in a two-layer film gives constant contributions to both effects and that these contributions are approximately equal to those observed in an isolated Dy film at temperatures lower than the T_C temperature of the Dy transition into the ferromagnetic state (approx 100 K for the films studied). It is assumed that such a behavior of the magnetooptical effects is due to the influence of the spin system of the NiFe layer on the magnetic state of the Dy layer enhanced by the penetration of Ni and Fe ions into the Dy layer to a large depth, as follows from the data obtained using Auger electron spectroscopy.