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Magnetic behaviour of γ-Fe2O3 nanoparticles by mössbauer spectroscopy and magnetic measurements

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Abstract

γ-Fe2O3 nanoparticles with varying state of dispersion in a polymer have been investigated by Mössbauer spectroscopy, static magnetic measurements at low applied field, and alternative susceptibility measurements over a large range of frequencies (2×10−2–104 Hz). The dynamical behaviour was characterized through the variation of the blocking temperature with the characteristic time of the measurement. The Mössbauer blocking temperature was determined according to a procedure described. For quasi-isolated particles an Arrhenius law is demonstrated. Effects of interparticle interactions in concentrated and aggregated systems are satisfactorily explained by the previous model. Dependence of the superparamagnetic susceptibility on the experimental conditions interpreted using the Lorentz or Onsager fields is mentioned.

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Authors and Affiliations

  1. LCMC (URA1466), Université Pierre et Marie Curie, 75252, Paris Cedex 05, France

    E. Tronc, P. Prene & J. P. Jolivet

  2. Dipartimento di Fisica, Università, 67100, L'Aquila, Italy

    F. d'Orazio & F. Lucari

  3. IC-MAT, CNR, CP10, 00016, Monterotondo Stazione, Italy

    D. Fiorani

  4. Faculdade de Ciencas, LCMBT, 1700, Lisbon, Portugal

    M. Godinho

  5. LMMM, CNRS, 92195, Meudon Cedex, France

    R. Cherkaoui, M. Nogues & J. L. Dormann

Authors
  1. E. Tronc
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  2. P. Prene
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  3. J. P. Jolivet
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  4. F. d'Orazio
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  5. F. Lucari
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  6. D. Fiorani
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  7. M. Godinho
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  8. R. Cherkaoui
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  9. M. Nogues
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  10. J. L. Dormann
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Tronc, E., Prene, P., Jolivet, J.P. et al. Magnetic behaviour of γ-Fe2O3 nanoparticles by mössbauer spectroscopy and magnetic measurements. Hyperfine Interact 95, 129–148 (1995). https://doi.org/10.1007/BF02146310

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