Abstract: The magnetoimpedance (MI) response of near-zero magnetostriction Co-based amorphous ribbons with different width ranging from 0.35?mm to 0.90?mm was investigated in the frequency range of 10 MHz?3.5?GHz. It was found that the wider ribbon displays the softer magnetic behavior and larger magnetoimpedance. MI response is characterized by two symmetrical peaks corresponding at the two opposite directions of applied magnetic field. The value of magnetic field at the peaks of MI should be assigned to the anisotropy field. Frequency dependencies of anisotropy field for the range 500?1000?MHz could be understood in the framework of skin penetration effect in the ribbons except to that of lowest width (0.35?mm) where the ferromagnetic resonance phenomenon could be predominant at this frequency range. Ferromagnetic resonance was detected in all samples, and for magnetic fields above 4?kA/m the square of resonance frequency quadratically fits vs. the applied field. Given the saturation magnetization, both the anisotropy field and the Landé factor have been determined.

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