Abstract
The size effect on FMR in polycrystalline MgFe 2 O 4 spheres, with the same surface roughness, has been investigated to elucidate the origin of FMR parameters. The signal intensity (S I ), resonance field (H res ), and line width (ΔH) were found to be increased proportional to r 3 (r is the sample radius). The values of H rcs (0) and ΔH(0) obtained by extrapolating the data on H res (r) and ΔH(r) measured at several sizes to r = 0, were in good agreement with those calculated using Schlomann's equations for internal field and ΔH, respectively. These results mean that discrepancies between the measured FMR parameters and those calculated by Schlomann's equations can be ascribed to the effect of sample size. Meanwhile, our result of the size dependence of ΔH was in contradiction to that reported by Dionne where ΔH was proportional to 1/r at a given surface roughness. This contradiction between our and Dionne's results is discussed by means of the definition of ΔH and the concept of physical properties.
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