Abstract
Tailoring of soft and hard magnetic materials can be performed by nanocrystallisation. Random anisotropy and intergranular exchange govern the macroscopic properties of nanocrystalline ferromagnets. The nature and topology of the intergranular region, matrix or grain boundaries, determine the degree of intergranular coupling. Important information about magnetic and topological properties of grain boundaries can be inferred from Mossbauer spectroscopy. The state of the art of those tailored materials is reviewed paying special attention to the correlation between nanostructure and macroscopic properties.
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