Large GMI effect in Co-rich amorphous wire by tensile stress

Domain Transformation and MI of Melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 Microwires by Cryogenic Joule Annealing

“…The giant magneto-impedance (GMI) effect of these wires which used for weak-field detection and high-resolution sensors has been attracted much attentions [1][2][3] . Many previous works focused on annealing treatment for improving the GMI ratio and field response sensitivity of the microwires simultaneously by releasing the residual inner stress of an as-quenched microwire which enhances the circumferential permeability μ φ , such as joule heat-treatment and stress annealing [4][5][6][7][8] . Based on the definition of GMI ratio, ΔZ∕Z 0 (%)=((Z(H ex )-Z(H 0 ))∕Z(H 0 )×100%, reducing Z 0 is an immediate method to enhance the GMI ratio through annealing treatment while increase the Z max or keep it unchanged.…”

Magnetoimpedance and Field Sensitivity of CoFeSiB Amorphous Ribbons under Applied Tensile Stress

“…It is known that application of an external tensile stress increases the inner core domains under stress-induced magnetoelastic field, develops an axial anisotropy, and hence reduces the MI effect [15]. Zhang et al [16] studied the MIR of amorphous cobalt-based wires in the frequency range of 0.1 to 20 MHz before and after applying an axial tensile stress. The highest percentage of the magnetic impedance achieved at a frequency of 15 MHz, and it was 261 % under a tension of 103 MPa with the highest amount of field sensitivity of 6.73 %/Oe.…”

Enhanced magnetoimpedance effect of carbon fiber/Fe-based alloy coaxial composite by tensile stress

“…Cu, Ag and other metal conductors are typical material using for inner conductor [24,25]. It has been demonstrated that the GMI effect is quite sensitive to the applied stress by the regulation of the magnetic domain structure under tensile stress [26,27]. For wire-like magnetic materials with negative magnetostriction, a tensile stress along the axis of wire induces a magnetoelastic anisotropy, which governs the domain structure with circumferential magnetic moments.…”