Magnetic Properties and Large Barkhausen Effect of FeCo, FeCr, FeNi System Amorphous Wires

Fe-rich and Co-rich amorphous magnetostrictive wires have shown sensitive bistable flux reversal (large Barkhausen effect or re-entrant flux reversal) characteristics. Fe-Co, Fe-Cr and Fe-Ni system amorphous wires were prepared, and their various magnetic properties (Ms, Mr/Ms, Ku, ¿s, H*, and ¿sMs/Ku) were measured to investigate the general properties of the large Barkhausen effect and stress sensitivity of such amorphous wire. A domain wall propagates through an inner core of diameter about 1/¿2 times that of positive-magnetostriction wires, and about 1/¿3 times that of negative-magnetostriction wires. The stress sensitivity of magnetization was analyzed using a figure of merit F defined as (3/2) ¿sMs (1¿(Mr/Ms)²) (Mr/Ms)/Ku.