Influence of Chemical Composition on the Curie Temperature Change in Amorphous Alloys

Amorphous alloys are characterized by a disordered structure. The arrangement of atoms is chaotic and it is difficult to determine the parameters describing their properties. In soft magnetic ferromagnets, one of the main parameters describing their applicability is the Curie temperature. However, in amorphous materials, due to their metastable nature, the Curie temperature occurs in a rather narrow range. Using the measurements of the magnetic saturation polarization as a function of temperature and the critical exponent beta = 0.36, the value of the Curie temperature can be determined. The paper presents the results of mu M-0(T)(1/beta) tests carried out for two amorphous alloys with similar chemical composition. The influence of chemical composition on the course of the mu M-0(T) curve and changes in the share of characteristic areas describing rearrangements of atoms in the structure of alloys were observed.