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Static magneto-optical birefringence of size-sorted γ-Fe2O3 nanoparticles

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Abstract:

Magnetic birefringence experiments under static field are performed on ionic ferrofluid samples based on γ-Fe2O3 -Fe2O3. A colloidal size-sorting of the particles allows to obtain narrow size distributions. The optical birefringence of the solutions is found positive and can be described by a Langevin formalism. It scales as H2 in the low field limit. In the high field limit the particles size dependence of the saturation birefringence is compatible with a surface anisotropy constant K S erg cm-2=2.8 ×10-2 erg cm-2 associated with a particle elongation of 1.25 both coherent with Néel predictions of surface anisotropy in small grains.

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Authors and Affiliations

  1. Laboratoire des Milieux Désordonnés et Hétérogènes, Université Pierre et Marie Curie, Tour 13, Case 78, 4 place Jussieu, 75252 Paris Cedex 05, France, FR

    E. Hasmonay, J.-C. Bacri & R. Perzynski

  2. Laboratoire des Liquides Ioniques et Interfaces Chargées, Université Pierre et Marie Curie, Bâtiment F, Case 63, 4 place Jussieu, 75252 Paris Cedex 05, France, FR

    E. Dubois

  3. Laboratory of Kinetics of Anisotropic Fluids, Institute of Continuous Media Mechanics, Urals Branch of the Russian Academy of Sciences, 1 Korolyov St., Perm 614013, Russia, RU

    Y.L. Raikher & V.I. Stepanov

Authors
  1. E. Hasmonay
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  2. E. Dubois
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  3. J.-C. Bacri
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  4. R. Perzynski
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  5. Y.L. Raikher
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  6. V.I. Stepanov
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Additional information

Received: 9 January 1998 / Received in final form and Accepted: 5 May 1998

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Hasmonay, E., Dubois, E., Bacri, JC. et al. Static magneto-optical birefringence of size-sorted γ-Fe2O3 nanoparticles. Eur. Phys. J. B 5, 859–867 (1998). https://doi.org/10.1007/s100510050512

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  • DOI: https://doi.org/10.1007/s100510050512

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