The influence of quenching rate on magnetic properties of amorphous ribbons

Five sets of amorphous ribbons of the composition Fe_73.5Cu₁Nb₃Si_13.5B₉ produced with different quenching rates (QR) were studied in order to verify the influence of the topological disorder on magnetic properties. For this purpose several magnetic methods were applied. Significant differences have been found between the results of magnetic disaccommodation H_e⋅Δμ/μ, pinning field H_p and stress dependence of the magnetic permeability μ/μ₀(σ) of as‐cast materials produced at different QR. The values of H_e⋅Δμ/μ and H_p are directly proportional to the disorder degree of the samples. The μ/μ₀(σ) curves display broad maxima, which are found to be related to the quenched‐in stresses. In contrast with these results, no significant effects of the amorphous structure on the Curie temperature and Mössbauer spectra were found, because other parameters are dominating.