Abstract
In precipitation alloys, a gradual transition of composition (interface) is expected between precipitates and matrix. Since the Curie temperature of solid solutions is a continuous function of composition, this implies that the effective volume Veff of ferromagnetic precipitates in a nonferromagnetic matrix, and the effective ferromagnetic packing fraction peff both depend on temperature (interface effect). It is shown that deviations of the superparamagnetic behavior of Fe-Ni-Cu alloys from that calculated for particles with constant volume and the maximum possible magnetostatic interaction effect, may quantitatively be accounted for by the interface effect. On account of the fact that the interface effect is proportional to the surface-to-volume ratio, and that this ratio at a given volume is for spheres smaller than for any other particle shape, a corresponding analysis of experimental data also permits to distinguish between spheres and other particle shapes.
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