NONMONOTONIC CHANGE OF THE COMPOSITION OF SURFACE LAYERS OF THE MELT Co <sub>57 </sub>Ni <sub>10</sub>Fe <sub>5</sub>Si <sub>11</sub>B <sub>17</sub> DURING ISOTHERMAL PROCESS
XPS study of the surface layers composition of Co 57Ni 10Fe 5Si 11B 17 alloy in liquid state at temperature change and during isothermal process is carried out. In the melt jump-like changes of the surface layers composition are detected, they are interpreted as the structural transformations in the liquid state. Nonmonotonic behavior of the surface layers composition of Co 57Ni 10Fe 5Si 11B 17 melt (criterion Co/Fe) is detected during isothermal process. Most instability of the melt is observed in the structural transformation region.