Influence of heterogeneity on magnetic response of nanocrystalline ribbons

FeNbCuBSi nanocrystalline ribbons are known to show heterogeneities influencing their magnetic properties. To search for a heterogeneity-specific response, the incremental permeability mu(Delta) method was used and domain structure observations served related arguments. Such a response can be found in the hysteresis shown by a plateau observed in the AA field variation. Domain structure observation confirmed the existence of an off-plane anisotropy due to the heterogeneity as well as the participation of wall movement when mu(Delta) shows the plateau. Nanocrystalline ribbons, being two-phase materials, show different macroscopic heterogeneity (MH) if compared to a metallic glass. (C) 2003 Elsevier B.V. All rights reserved.