Magnetostrictive torsional strain in transverse-field-annealedMetglas®2605

Amorphous metals exhibit excellent magnetomechanical properties and have been considered for transducer applications. We report an experimental study on the magnetostrictive torsional strain induced under the action of a helical magnetic field in transverse-field-annealed amorphous ribbons with a nominal composition of ${\mathrm{Fe}}_{81}$ ${\mathrm{B}}_{13.5}$ ${\mathrm{Si}}_{3.5}$C 2. The torsional deflection reaches large values at about 5 rad $m^{\mathrm{-}1}$. A theoretical model for magnetostrictive torsion is presented. The model is used to obtain direct information about the magnetostriction constant and transverse magnetization process from torsion-angle measurements. Comparison between theory and experiment shows an overall agreement.