Magnetic instability of (Fe0.06Co0.94) -B amorphous alloy system

The causes of magnetic instability, which is a change in magnetic properties at temperatures well below the crystallization temperature, are clarified experimentally for the (Fe0.06Co0.94) -B amorphous ferromagnetic alloy system. This instability is found not to be caused by crystallization or relaxation of residual stress. The induction field applied when the alloy is molten and solidified into the amorphous state is shown to influence the structure of the amorphous state resulting in magnetic instability. A model of the mechanism for this instability is proposed. This model can explain experimental results.