MAGNETOSTRICTIVE AND PIEZOMAGNETIC PROPERTIES OF THE FE73.5CU1NB3SI15.5B7 METALLIC-GLASS ANNEALED IN HELIUM

The effect of different heat treatments on the piezomagnetic propertie s and magnetostriction of Fe73.5Cu1Nb3Si13.5B9 metallic glass were inv estigated 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 degrees C for 1/4 and 1 h, respectively. The magnetostrictive hysteresis loops were measured using the strain gauge method. The values of magnetostr iction (lambda) at a magnetic field equal to about 3 kA/m in all cases were equal to about 22 X 10(-6).