Processing and properties of soft magnetic Fe/sub 40/Co/sub 40/P/sub 14/B/sub 6/ amorphous alloy

The Fe/sub 40/Co/sub 40/P/sub 14/B/sub 6/ metallic alloy has been prepared in a glassy state by a melt-spinning process. The 15-25 /spl mu/m thick as-quenched ribbons have superior soft magnetic properties compared with those of well-known Fe/sub 40/Ni/sub 40/P/sub 14/B/sub 6/ glass: the saturation magnetization is about 1.45 T, coercive field 4.0 A/m @ 0.1 Hz, incremental magnetic permeability /spl mu//sub max//spl sim/90000 @ 60 Hz and Curie temperature above 700 K. The crystallization temperature, determined by differential scanning calorimeter, is approximately 60 K higher than that for FeNi-based alloy, indicating the enhanced thermal stability of FeCo-glass.