Very large Magneto-impedance and its scaling behavior in amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon

TL;DR

This paper reports a record-high -99% magneto-impedance change in amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon, demonstrating a frequency-independent scaling behavior and proposing a phenomenological model for Z(H).

Contribution

It introduces the first observation of such a large MI change and a new phenomenological formula describing its scaled behavior.

Findings

Maximum MI change of -99% observed.

MI scaling behavior is frequency independent.

Proposed phenomenological formula fits experimental data.

Abstract

Magneto-impedance (MI) effects have been observed for amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon which has been excited by an a.c. magnetic field parallel to the length of the ribbon. Maximum relative change in MI as large as -99% was observed which has never been reported before. The relative change in MI, when plotted against scaled field was found to be nearly frequency independent. A phenomenological formula for magneto-impedance, Z(H), in a ferromagnetic material, is proposed based on Pade approximant to describe the scaled behavior of MI.