Temperature, stress, and structural-relaxation dependence of the magnetostriction in (${\mathrm{Co}}_{0.94}$/${\mathrm{BFe}}_{0.06}$${)}_{75}$/${\mathrm{BSi}}_{15}$${\mathrm{B}}_{10}$ glasses

High-sensitivity measurements of the magnetostriction constant ${\lambda }_s$ have been performed in the nearly zero magnetostriction (${\mathrm{Co}}_{0.94}$ ${\mathrm{Fe}}_{0.06}$ ${)}_{75}$ ${\mathrm{Si}}_{15}$ ${\mathrm{B}}_{10}$ metallic glass as a function of the stress and temperature after pulse-annealing treatments. A stress dependence of ${\lambda }_s$ in this amorphous alloy is reported for the first time. At room temperature a slope of about -2×${10}^{\mathrm{-}7}$ ${\mathrm{GPa}}^{\mathrm{-}1}$ has been determined leading to a change in the sign of the magnetostriction constant in some circumstances. For determination of the thermal variation of ${\lambda }_s$, the temperature was changed by means of the alternating current flowing through the sample during the measurement, which was done by the small-angle magnetization-rotation (SAMR) method. The compensation temperatures, i.e., those temperatures at which the value of ${\lambda }_s$ vanishes in going from negative to positive, were determined after isochronal annealing. In this way, the evolution of the single-ion and two-ion contributions to the magneto- striction was monitored during the structural relaxation. The ratio between the two contributions follows a chemical short-range-order kinetics. The stress dependence of the single-ion and two-ion contributions was deduced from measurements of the stress dependence of the magnetostriction at different temperatures.