Large gyromagnetic effect in FeSiB amorphous wires

Results on a new effect observed in FeSiB amorphous wires-the large gyromagnetic effect-are reported for the first time. This effect consists in the appearance of a rotation of the sample around its axis with frequencies from 1 to 60 Hz when the sample is subjected to an axial alternating magnetic field of /spl sim/10/sup 2/ A/m having a frequency of /spl sim/10/sup 4/ Hz. Both the sample rotation frequency and the frequency of the field at which the effect appears depend on the sample length, the characteristics of this dependence indicating that the appearance of the effect is closely related to the formation of a standing wave associated to the oscillation of the magnetic moments. The magnitude of the wire´s magnetostriction constant is also essential as concerns the appearance of the large gyromagnetic effect.