Off-Diagonal Magnetoimpedance Dependence of Magnetostriction and Anisotropy in Co-Based and Fe-Based Amorphous Ribbons

Abstract

The object of this work is the comparison of domain structure and off-diagonal magnetoimpedance effect in amorphous ribbons with different magnetostriction coefficient. The Co 66 Fe 4 Ni 1 Si 15 B 14 and Fe 80 B 20 samples were obtained by melt-spinning. During the quenching procedure a 0.07 T transverse magnetic field was applied to some of the samples. Domain patterns obtained by the Bitter technique confirm that the differences on the samples are related to the different anisotropy and magnetostriction coefficient, and the quenching procedure. Small changes on the anisotropy distribution and the magnetostriction coefficient can be detected by the off-diagonal impedance spectra as a consequence of the different permeability values of the samples.

Influence of a magnetic field applied during the quenching process on the spin density and nanoscale structure of an amorphous Fe–B ribbon

“…Domain patterns are not observed on the field quenched ribbon surface due to the magnetization lying in the ribbon plane through the entire sample. The remarked domain structure difference on the ribbons surface is a consequence of the transverse anisotropy component induced on the sample produced with the external magnetic field during the quenching procedure [11].…”