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

Springer Science and Business Media LLC - Tập 95 - Trang 129-148 - 1995
E. Tronc1, P. Prene1, J. P. Jolivet1, F. d'Orazio2, F. Lucari2, D. Fiorani3, M. Godinho4, R. Cherkaoui5, M. Nogues5, J. L. Dormann5
1LCMC (URA1466), Université Pierre et Marie Curie, Paris Cedex 05, France
2Dipartimento di Fisica, Università, L'Aquila, Italy
3IC-MAT, CNR, Monterotondo Stazione, Italy
4Faculdade de Ciencas, LCMBT, Lisbon, Portugal
5LMMM, CNRS, Meudon Cedex, France

Tóm tắt

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.

Tài liệu tham khảo

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