Annealing and neutron-irradiation effects on the permeability of Fe86Zr7B6Cu1

The effects of annealing and neutron irradiation on the magnetic properties of amorphous Fe86Zr7B6Cu1 alloys have been investigated by means of the changes of the longitudinal permeability ratio (LPR). In general, there are no differences in magnitude and shape of the LPR curves between as-quenched amorphous and neutron-irradiated samples. This indicates that the effects of neutron irradiation on the magnetic properties of the as-quenched sample are negligible. But a drastic decrease, caused by neutron irradiation, is observed in the magnitude of the LPR and the broadening of the LPR curves of the sample annealed at 650 deg. C, which has a maximum value of the LPR due to the presence of ultra-soft magnetic materials. This can be attributed to a decrease in domain wall displacement and to a magnetization rotation due to the neutron irradiation effect. The local anisotropy plays a significant role in the case of this sample