Influence of intrinsic and induced anisotropy on magnetoimpedance effect in amorphous CO67Fe4Mo1.5Si16.5B11

Abstract Influence of anisotropy on magnetoimpedance (MI) effect in amorphous Co67Fe4Mo1.5Si16.5B11 alloy prepared with varying quenching rate (QR) from melt and after annealing in transverse magnetic field has been studied. Intrinsic and induced anisotropies influence significantly the MI ratio and sensitivity to the applied field. Specimen prepared with lower QR in as-cast state as well as after field annealing shows sharp increase in MI ratio, attributed to the induction of transverse anisotropy in these specimens. The maximum MI ratio and sensitivity to magnetic field were obtained for the slower quenched sample and after transverse field annealing. The corresponding values of maximum MI ratio and the sensitivity to applied field are 121.5% and 19.5%/Oe, respectively.