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 (M
_s
, M
_r
/M
_s
, K
_u
, θ
_s
, H*, and θ
_s
M
_s
/K
_u
) 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) θ
_s
M
_s
(1-(M
_r
/M
_s
)
²
) (M
_r
/M
_s
)/K
_u
.