Abstract
The ferromagnetic properties of compaction-prepared nanocrystalline Ni specimens, (crystallite size 10 nm) were investigated in order to study the correlation between the disordered interfacial structure and the macroscopic properties. The magnetic moment of the atoms in the interfaces is decreased to 0.34 μB/atom (0.6 μB/atom in bulk Ni) and the Curie temperature T ci =545 K of the interfacial components is lower than the value T cb =630 K of the Ni bulk crystal. Both results are due to open structure of the interfaces and will be discussed within a band model of itinerant ferromagnetism. The temperature variation of the coercivity H c of the nanocrystalline specimens suggest a model of weak magnetic coupling of single-domain particles with a non-spherical shape.
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