Longitudinally driven giant magnetoimpedance effect in stress-annealed Fe-based nanocrystalline ribbons

A high-frequency longitudinally driven giant magnetoimpedance (GMI) effect has been measured in stress-annealed Fe73Cu1Nb1.5V2Si13.5B9 nanocrystalline ribbons. Based on how the impedance phase varies with the external magneti c field, it becomes clear that the imaginary part of the complex permeabili ty, mu ", which is related to magnetic losses, plays an important role in t he high-frequency longitudinally driven GMI effect. The transverse anisotro py field H-k can be readily determined by a sharp minimum in the curve of t he impedance phase as a function of the external magnetic field. This provi des a new method for measuring the magnetic anisotropy field in such system s. (C) 2000 American Institute of Physics. [S0021-8979(00)56908-4].