Influence of etching of the surface on the magnetic properties of amorphous and nanocrystalline Fe_(73.5)Cu_1Nb_3Si_(15.5)B_7 ribbon

摘要

Here we present the results for the influence of etching of the surfaces of the amorphous Fe_(73.5)Cu_1Nb_3Si_(15.5)B_7 ribbon on its magnetic properties in amorphous state and states obtained by successive annealing for one hour at several temperatures T_a ≤ 450 ℃. 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 of the successively annealed sample show that etching does not improve properties of the nanocrystallized FeCuNbSiB ribbons.