High √???? frequency GMI effect in glass-coated amorphous wires

In this paper the GMI effect at high frequency region (between 10 MHz and 500 MHz) in different families of amorphous microwires (Fe-rich, with positive magnetostriction constant, Co-rich with negative magnetostriction constant and Co-Fe-rich with nearly-zero magnetostriction constant) fabricated by the Taylor-Ulitovsky method. Generally Fe-rich compositions with positive magnetostriction constant, Co-rich compositions with negative magnetostriction constant and Co-Fe-rich compositions with vanishing magnetostriction constant glass-coated microwires fabricated by the Taylor-Ulitovsky method have been studied. The GMI effect is related intrinsically with the hysteresis loops of the samples. The chemical composition of glass-coated microwires drastically affects their magnetization curves: the hysteresis loop changes from rectangular for Fe-rich compositions to almost unhysteretic in Co-rich compositions.