Abstract
Domain structures and stress-induced anisotropy in some soft ferromagnetic materials are reported. Stress-Joule heating performed on amorphous Co 66Fe 4B 12Si 16Mo 2 induces an anisotropy perpendicular to the ribbon axis, as in nanocrystalline FeSiBCuNb alloys. However, in the case of FeZrB–Cu–Nb systems, large longitudinal domains are observed. We think that the origin of this anisotropy comes from the so-called back stress effect as previously proposed by Herzer. As magnetostrictions of both α-Fe and α-FeSi crystallites are negative, the frozen-in stress exerted on α-Fe nanograins is expected to be compressive-type. We suggest that this surprising behaviour is related to more pronounced creep because of the smaller hardness of α-Fe nanograins.
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