CoFeBSi amorphous ribbons were current-annealed at 600 mA for times ranging from 9 sec to 5 min. Their complex impedance response was measured in the frequency range 5 Hz-13 MHz, under a DC field of zero and at 6.3 kA/m. Transverse permeability (and therefore magnetoimpedance) showed a maximum for an annealing time of /spl sim/1 min, while the propagating field (or unpinning field) for transverse domain walls, exhibited a minimum for the same annealing time. These results show the direct dependence of magnetoimpedance on transverse induced anisotropy, and are interpreted in terms of the dependence of the latter on two competing configurations.
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