Abstract

The magneto-impedance (MI) effect is investigated in etched thin zero-magnetostrictive amorphous wires having 4.5-30 /spl mu/m diameters. The MI effect gradually decreased with decreasing diameter and then the large Barkhausen effect appeared in thinner wires having 5-10 /spl mu/m diameters. Longitudinal BH loops are measured and estimated the average anisotropy direction in each etched wire considering the anisotropy energy change. A sensitive MI field sensor is constituted using the etched wire head having 16 /spl mu/m diameter and 0.7 mm length magnetized with a pulse current using CMOS multivibrator.

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