Low-frequency circumferential magnetization curves in magnetostrictive amorphous wires

Circumferential magnetization curves have been derived from the imaginary component of the impedance response in an Fe73.5Si13.5B9Cu1Nb3 amorphous wire. Measurements were performed at 1 kHz driving frequency, and 0.05- 20 mArms current amplitude range. Axial DC fields from 0 to 100 Oe have been simultaneously applied in order to detect the magnetoinductive effect. The circular magnetization curves are compared with quasi-static longitudinal magnetization ones, and the results are analyzed on the basis of the core-shell model for a wire with positive magnetostriction.