Two series of Fe-Si-B-Cu-Nb-based ribbons with partial substitution of alum
inium were investigated with respect to their magnetoimpedance and the infl
uence of heat treatments on it. Although the original Finemet composition (
f = s = b = 0) showed a much higher magnetoimpedance ratio, substitution of
Si by Al improves the field sensitivity of the GMI response. (C) 1999 Else
vier Science B.V. All rights reserved.