Giant magneto-impedance effect in thin amorphous wires at elevated frequencies

We report on novel results on observation of the giant magneto-impedance effect in amorphous microwires with different magnetostriction constant (Fe-rich, with positive magnetostriction constant, Co-rich with negative magnetostriction constant and Co-Fe-rich with nearly-zero magnetostriction constant) in the high frequency region (between 10 MHz and 500 MHz). The observed dependencies have been interpreted in terms of different magneto-elastic energy induced by the fabrication process.