Magnetostriction of ribbon-form amorphous and crystalline ferromagnetic alloys

By rapid quenching methods, ribbon-form Sendust alloys, silicon-iron ribbons Fe100−xSix (4 wt%<x<10 wt%) in the crystalline state as well as iron-boron and iron-cobalt-silicon-boron ribbons in the amorphous state were prepared. All of the ribbons obtained were remarkably flexible. The magnetostriction constant became zero at about the composition Fe92.5Si7.5 and Fe84.74Si 9.71Al5.55. The coercive force Hc and the initial permeability μi in a Sendust straight ribbon with Fe84.9Si9.62Al5.48 were 24 mOe and 30000 respectively after annealing. The magnetostriction constants in Fe100−xBx amorphous ribbons became larger by annealing at 300°C for 3 hours in Ar atmosphere and reached 49×10−6 at x=12.