Low-temperature magnetization study of crystalline and glassy Fe-B alloys

The low-temperature dependence of the magentization is reported for crystalline and glassy Fe_100-xBₓ alloys. Although the temperature coefficients reduced to the Curie temperatures are four to five times larger for the glassy alloys than the crystalline ones, all of the alloys exhibit Bloch's T3/2 dependence. The spin-wave stiffness constant deduced from the temperature coefficient reaches a broad minimum (D~65 meV {}A²) for x=14-16. This observation seems to be consistent with the Invar-like behavior reported recently for the similar alloys.