Giant Magnetoimpedance of Electrochemically Surface Modified Co-Based Amorphous Ribbons

The magnetic properties, the magnetoimpedance effect and the surface morphology of amorphous FeCoCrSiB and ribbons FeCoSiB are comparatively analyzed for as-quenched state and after electrochemical surface modification in a conventional three-electrode glass cell with a phosphate buffer saline. The pH value 7.3 and the temperature of 37 $^{\circ}$C were maintained during the electrochemical treatment in order to simulate the human body living conditions The FeCoCrSiB ribbons show an excellent corrosion stability and high magnetoimpedance response; hence they can be used in magnetic labels detectors. FeCoSiB ribbons show low corrosion resistance but a high enough magnetoimpedance. Therefore, they can be proposed for label free type MI detectors. Furthermore, the results show that the magnetoimpendance effect can be proposed as a probe for biocorrosion and other surface effects.