Tensile stress dependence of the Curie temperature and hyperfine held in Fe-Zr-B-(Cu) amorphous alloys

FeZrB(Cu) metallic glasses present the same Invar (like) properties as the pure FeZr ones, in particular a large dependence of the Curie temperature on pressure. Magnetic and Mossbauer measurements show a decrease of the Invar character as the boron concentration increases, with a linear relationship between the change of Curie, temperature per unit stress and the reciprocal of the Curie temperature itself. The influence of boron is shown to greatly enhance the weak itinerant ferromagnetism of FeZr glasses leading to stronger ferromagnetic behavior.