MAGNETOSTRICTION OF FE100-XBX GLASSES

Magnetostriction λs has been measured at room temperature and 80 K in Fe100-xBx (14?x?23 at.%) glasses using metal foil strain gauges. Several compositions were also studied as a function of temperature from 80 K to T ? TC. The single-ion uniaxial temperature dependence confirmed previously for Fe80B20 glass is also observed here for x=20 and 22. At lower boron concentrations departures from this expected temperature dependence are observed. The values of λs(295K) show a broad maximum of about 35×10 -6 at x?20 at.%B. Crystallization of the glasses gives rise to a nonmonotonic temperature dependence of λs.