Crystallization and domain properties of thinned amorphous FeBSi ribbon

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Abstract
A transmission electron microscope study has been made of the crystallization and associated domain behavior of an amorphous Fe82B15Si3 alloy. The first obvious signs of crystallization in microscope-annealed foils occur at a temperature of about 345 °C with the appearance of α-iron nuclei. These crystallites grow with annealing time but the grain size at complete crystallization is still small (∼0.1 μm). At a temperature of 500 °C a bct Fe2B phase is formed. Furnace annealed specimens differ in that the iron nuclei have a dendritic morphology. The as-quenched material shows an isotropic domain structure with no magnetization ripple. The onset of crystallization is accompanied by the formation of this magnetization dispersion and, in some cases, stripe domains which reflect a perpendicular anisotropy. The results of in-situ magnetization observations of the domain structure clearly indicate the perturbing effects of the crystallization products.