Giant magnetoimpedance and induced anisotropy in joule-heated and conventionally annealed Co-based amorphous materials

Abstract The effect of induced magnetic anisotropy on GMI has been studied in Co 71 Fe 4 B 15 Si 10 melt spun amorphous ribbons, using two different techniques of thermomagnetic annealing. Quasi-static hysteresis loops were measured at controlled induction. From the quasi-static hysteresis loop evolution, the value of the macroscopic anisotropy K u induced by the field annealing treatment was determined. The evolution of the domain structure was observed using a Kerr-effect apparatus.