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The giant magnetoimpedance (GMI) dependence on the external magnetic field strength H in as cast Co70.5Fe4.5Si15B10 amorphous microwire exhibits double-peak behaviour. The position of sharp peaks is symmetrical with respect to zero external magnetic fields strength H=0 and corresponds to the critical field strength H=±Hm . The maximum GMI ratio (∆Z/Z)max dependence on the amplitude iac is analysed by means of the helical anisotropy (0<α<90o). The additional dc bias current idc in the interval from 0 to 0.25 mA with iac=0.1 mA was applied in order to observe the asymmetric GMI effect. The hysteresis in asymmetric GMI(H) dependences is explained by an irreversible magnetization rotation.

Relation Between Helical Anisotropy and Asymmetric Gmi Effect