Magnetostrictive and piezomagnetic properties of the Fe_73.5Cu₁Nb₃Sn_15.5B₇ metallic glass annealed in helium

The effect of different heat treatments on the piezomagnetic properties and magnetostriction of Fe_73.5Cu₁Nb₃Si_13.5B₉ metallic glass were investigated as a function of the bias magnetic field. The maximum values of the magnetomechanical coupling coefficient were equal to 0.15 for the as-quenched state, and 0.4 and 0.6 after annealing at 510 °C for 1/4 and 1 h, respectively. The magnetostrictive hysteresis loops were measured using the strain gauge method. The values of magnetostriction (A) at a magnetic field equal to about 3 kA/m in all cases were equal to about 22 × 10⁻⁶.