Influence of etching of the surface on the magnetic properties of amorphous and nanocrystalline Fe_73.5Cu₁Nb₃Si_15.5B₇ ribbon

Abstract
Here we present the results for the influence of etching of the surfaces of the amorphous Fe_73.5Cu₁Nb₃Si_15.5B₇ ribbon on its magnetic properties in amorphous state and states obtained by successive annealing for one hour at several temperatures T ≤ 450°C. We discuss the changes in the domain structure, anisotropy and domain wall (DW) pinning in terms of the corresponding changes in the average angle < δ > between the domain magnetizations and ribbon axis, coercive field H_c, remanent magnetization M_r and maximum permeability μ_max. The measurements show rather weak effects of etching on the magnetization processes and DW pinning in the amorphous state (small initial decrease of H_c). Results for the successively annealed sample show that etching does not improve properties of the nanocrystallized FeCuNbSiB ribbons.