Hopkinson Effect in Soft Magnetic Materials

摘要

The μi-T curves of the alloy Fe73.5 Cu1 Nb3 Si13.5 B9 in the amorphous state and in the nanocrystalline state have been investigated. For comparison, μi-T curves of the other two kinds of typical soft magnetic alloys also have been measured. It was found that a sharp Hopkinson peak appeared at the Curie point for each amorphous and crystalline alloy but there was no Hopkinson peak for the nanocrystalline alloy at the Curie point of the residual amorphous phase. This phenomenon has been explained in terms of the characteristic temperature dependence of the effective magnetic anisotropy.