Study of dipolar interaction in amorphous microwires using longitudinally driven magneto-impedance effect

The long-range dipole-dipole interaction in an array of Co57.3Fe7.6Cr1.7C33.4 amorphous microwires with axial bistability has been studied through magnetic hysteresis and longitudinally driven magneto-impedance (LDMI) measurements in this paper. Hysteresis loops performed for an array of microwires exhibit jumps and plateaux on the demagnetization curves. For LDMI curves, the multi-peak characteristic is presented as the number of microwires changes from 1 to 4. Each step in the hysteresis loops or each peak in the LDMI curves is correspondent to the magnetization reversal of an individual wire. To analysis the difference between the switching field of hysteresis loops and the peak field of LDMI curves, we further studied the dependence of the peak field on the driving current. The results showed that the ac magnetic field has a compensatory effect on the magnetization reversal of an individual wire.