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A systematic investigation of the magnetic properties of amorphous films in (RE) x Co 100 -x binary systems in the ground state with rare earth elements (RE) of different types has been performed. The con centration dependences of the average atomic magnetic moments of cobalt (m Co ), gadolinium (m Gd ), and terbium (m Tb ) have been determined from the analysis of the spontaneous magnetization of the films with a nonmagnetic rare earth element (La), a rare earth element with a spherical electron shell (Gd), and a rare earth element with a large orbital magnetic moment (Tb). It has been shown that, in the range 0 < x < 50 at %, the magnetic moment m Co decreases from 1.7 μ B to zero, the magnetic moment m Gd remains unchanged and almost coincides with the magnetic moment of the free atom (7 μ B ), and the value of m Tb decreases mono tonically, but the rate of decrease depends on the method of the sample preparation. The revealed regularities are associated with the concentration change in the electronic structure of cobalt and with the specificity of the magnetic structure of the films, which has a ferromagnetic, ferrimagnetic, or sperimagnetic character for samples containing La, Gd, or Tb, respectively.

In this work a systematic study of magnetic properties of amorphous TbxCo100-x and DyxCo100-x films is presented. In a composition range 15 < x < 40 at. %, temperature dependencies of spontaneous magnetization in a temperature interval 5 – 300 K as well as low-temperature 5 K hysteresis loops in magnetic field up to ±70 kOe have been obtained. We demonstrated, that the experimental results can be interpreted in a framework of a model considering a variable sperimagnetic cone angle of rare earth atoms up to 150°. A series of Tb-Dy-Co films with a composition close to Laves phase has been obtained. We demonstrated that the variation of rare earth content with Co content fixed does not lead to a systematic lowering of magnetic hysteresis.

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