Hysteretic Behavior and Anisotropy Fields in the Magneto-Impedance Effect

Abstract

An overview of the Magnetoimpedance effect (MI) in a series of magnetic materials with different geometries (wires, ribbons, tubes and thin films) and structures (crystalline, nanocrystalline and amorphous) is given. Two types of MI, namely single peak, SP, and two peak.TP, are discussed. The observation of both types of behaviours is general and depends on the amplitude and the frequency of a.c. current required to measure the impedance. A correlation between MI hysteresis and hysteresis loops is presented. The influence of the a.c. current frequency, magnetic anisotropies and irreversible magnetization processes upon the hysteretic MI effect is discussed. © 1999 Trans Tech Publications,.