Composition dependence of coercive force of some crystallized amorphous alloys

Amorphous ribbons of many compositions have been crystallized and the resulting permanent magnet properties explored. P and C gave much higher Hcthan B in Fe-Ni-base metallic glasses. When the Fe/Ni ratio is varied, Hcdrops precipitously when α-Fe appears. Rapid electrical pulse annealing generally gives higher Hcthan isothermal annealing. The highest coercive forces obtained were 16.7 kOe in a rare-earth alloy, 3.2 kOe in an alloy containing no rare earth, and 420 Oe in an alloy containing neither cobalt nor rare earth. In many alloys the remanence-to-saturation ratio is much greater than 0.5.