Abstract
Alloys of composition (Fe-Co)83(Sn-P)5B12 have been prepared by planar flow casting method in air with substitution Co = 0; 5; 10 at. % for Fe and substitution P = 2 at. % for Sn. All as-cast ribbons were amorphous and submitted to chemical and thermal analyses, scanning and transmission electron microscopy and magnetic measurements. Hysteresis loops of strips after nanocrystallization at 380 and 400 °C for 30 min changed their shape – the saturation magnetization increased for Co containing alloys Js = 1.74–1.80 T. The off-axis component of magnetic anisotropy decreased significantly due to the annealing. Coercivity in this case considerably increased due to the growth of grain size and crystalline volume fraction. The samples annealed at 350 °C disclosed a relaxed state with changes in microstructure and achieved very good soft-magnetic properties namely for P substituted alloys.
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