Comparative study of the giant stress impedance behavior of commercial amorphous ribbons for strain sensing applications

Abstract

The giant magnetoimpedance (GMI) and giant stress impedance (GSI) behaviors of amorphous ribbons composed of three commercially available materials (Co66Si15B14Fe4Ni1, Fe81B13Si3.5C2, and Ni40Fe40Si + B19Mo1-2) with differing saturation magnetostriction constants (λ s) and Young's moduli (E) were studied under longitudinal stress/strain. The linearity of the ribbons' GSI responses and gauge factors was measured to create a figure of merit and compare their stress/strain sensing performance for strains up to ɛ = 10 × 10-3. We observed that the Ni40Fe40Si + B19Mo1-2 ribbon displayed the best performance for low strains (ɛ < 1 × 10-3), whereas the Co66Si15B14Fe4Ni1 ribbon displayed the best performance for higher strains (ɛ < 10 × 10-3). We conclude that the suitability of a material for sensing strains in any given strain regime has a complex dependence on both λ s and E, the former of which dictates both the absolute magnitude of the impedance variation materials exhibit (i.e., the dynamic range), while both λ s and E control how their impedances vary with applied strain.