Giant magnetoimpedance in CoP electrodeposited microtubes

Co(90)P(10) amorphous microtubes with thickness ranging from 2 to 19 mu m were electrodeposited onto Cu wire substrates. Samples exhibit radial magnetic anisotropy as deduced from hysteresis loops and magnetic force microscopy imaging. These microtubes show quite noticeable giant magnetoimpedance effect (GMI) with amplitude depending on layer thickness and frequency. The hysteresis in the GMI curves is small, which can be ascribed to the radial anisotropy, Such small hysteresis is of importance for technological applications.