Stress-induced magnetic and structural anisotropy of nanocrystalline Fe-based alloys

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The structural anisotropy of Fe-Si-B-Nb-Cu nanocrystalline alloys annealed under tensile stress was studied by x-ray diffraction techniques with transmission geometry. A clear difference was observed in the peak positions of the Fe-Si crystals under two different conditions: with the diffraction vector parallel or perpendicular to the applied stress. The strains calculated from the anisotropy of the peak positions show a linear response to the applied stress, independent of Si content, indicating that the observed structural anisotropy is due to a quenching of the elastic strain, not in the directional ordering of the Fe-Si pair. The induced magnetic anisotropy energy is well explained by the residual strains and their magnetostrictions.