Influence of extreme dilutions on the magnetic properties of single-domain particle aggregates |
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| Authors: | Bottoni G Candolfo D Cecchetti A Masoli F |
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| Affiliation: | Istituto di Fisica delĺUniversità di Ferrara and the Gruppo Nazionale di Struttura della Materia (C.N.R.), Ferrara, Italy; |
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| Abstract: | Various magnetic properties of samples of single-domain particles dispersed in a nonmagnetic matrix are examined as functions of the packing fractionp. The range of variability ofpis from 0.0003 to 0.20. The squareness ratio and the rotational and alternating hysteresis integrals change withp, while the coercive field, the initial anhysteretic susceptibility, and the areas between the remanence curves are not dependent onp. These results are interpretated as a consequence of the formation of agglomerates interacting with each other, rather than as a consequence of analogous interactions among the single-domain particles which are in the aggregate. |
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