High saturation magnetization and microstructure in melt-spun Fe–P ribbons

A high saturation magnetization, Bs, of 1.9 T and coercivity, Hc, of 0.5 Oe were obtained in melt-spun ribbons of Fe–0.63 at.% P after magnetic annealing at 400 °C. Transmission electron microscopy studies revealed the presence of coarse Fe3P precipitates in as-spun ribbons, while these precipitates were found to be finer in annealed samples. The coercivity variation in the samples processed at various conditions was explained by the formation of the Fe3P precipitates.