A large magneto-impedance (MI) effect was found in amorphous magnetic wires through which a highfrequency current was applied. The amplitude of the induced voltage between the ends of a wire changes by 40∼50% when an external magnetic field of about 10 Oe (∼800 A/m) is applied parallel to the wire axis. This paper reports the principles and basic properties of the MI effect in micro-sized amorphous wires with a composition of (Fe0.06Co0.94)72.5Si12.5B15 and magnetostriction of −10-7, and describes an application to a rotary encoder head using the microsized MI elements having 30μm in diameter and 1 mm in length.
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Bushida et al. (1994) studied this question.
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