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Nanoparticles

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Il Nuovo Cimento D

Summary

Mössbauer spectroscopy is well known to be a very sensitive technique for studying small magnetic particles: small variations in the dynamic properties often manifest themselves as rather large changes in the spectra. However, anay detailed investigation is limited by the complexity of the phenomena and also by the line shape problem. As a result, variations in Mössbauer features between samples can always be interpreted in several ways. Utilization of other techniques to support the conclusions in indispensable. This will be emphasized in the case of γ-Fe2O3 nanoparticles, the dynamic properties of which have been studied over a very wide time range using measurements of the zero-field-cooled magnetization, thermoremanent magnetization, and a.c. susceptibility at various frequencies, in addition to Mössbauer spectroscopy. After a survey of the basic laws of superparamagnetic relaxation and the effects of interparticle interactions, this paper will show how the approximations usually made for interpreting Mössbauer data can lead to misinterpretation of the phenomena.

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Authors and Affiliations

  1. Chimie de la Matière Condensée (CNRS URA 1466), T54-E5, Université Pierre et Marie Curie, 4 Place Jussieu, 75252, Paris Cedex 05, France

    E. Tronc

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Tronc, E. Nanoparticles. Il Nuovo Cimento D 18, 163–180 (1996). https://doi.org/10.1007/BF02458890

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  • DOI: https://doi.org/10.1007/BF02458890

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