Abstract
Abstract The relaxation time of the magnetisation of fine ferromagnetic particles is calculated in its dependence on short-range and long-range interaction effects. The former reduce to a Vogel-Fulcher law by using a Landau-Ginzburg formalism. The latter are described by a mean field formalism but more consistently and conventionally than in the earlier work of Jaep. The static susceptibility is expressed as a Curie-Weiss-like law with a characteristic temperature, which is calculated microscopically. The interaction energy is found to be field dependent. Comparison is made with ferrofluids; other fine particle materials are also proposed for this purpose.
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