Abstract
Effects of Ni addition on the microstructure and the dynamic magnetic properties of Nanoperm alloys were studied. It is shown that for the Ni-addition Nanoperm alloys, there exists a critical austenitic grain size, below which γ-(Fe, Ni) (austenitic) phase becomes more stable than α-(Fe, Ni) (martensitic) phase. The Ni addition in Nanoperm alloys may make the non-ferromagnetic γ-(Fe, Ni) nanocrystallites form between the ferromagnetic α-(Fe, Ni) nanocrystallites, which results in the interruption of exchange coupling between ferromagnetic crystallites and the anisotropy cannot be effectively averaged out. In addition, the formation of the non-ferromagnetic nanocrystallites has pinning effect on domain wall motion. These results may explain why the Ni addition may drastically deteriorate the soft magnetic properties of Nanoperm alloys. The effects of the Ni addition on the nanocrystalline materials and the coarse-grained materials are completely different.
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