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The off-diagonal magnetoimpedance in field-annealed CoFeSiB amorphous ribbonswas measured in the low-frequency range using a pick-up coil wound around thesample. The asymmetric two-peak behavior of the field dependence of theoff-diagonal impedance was observed. The asymmetry is attributed to theformation of a hard magnetic crystalline phase at the ribbon surface. Theexperimental results are interpreted in terms of the surface impedance tensor.It is assumed that the ribbon consists of an inner amorphous region and surfacecrystalline layers. The coupling between the crystalline and amorphous phasesis described through an effective bias field. A qualitative agreement betweenthe calculated dependences and experimental data is demonstrated. The resultsobtained may be useful for development of weak magnetic-field sensors.Comment: 19 pages, 6 figure

Off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons