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Static magneto-optical birefringence of size-sorted γ-Fe 2 O 3 nanoparticles

Author

Listed:
  • E. Hasmonay
  • E. Dubois
  • J.-C. Bacri
  • R. Perzynski
  • Y.L. Raikher
  • V.I. Stepanov

Abstract

Magnetic birefringence experiments under static field are performed on ionic ferrofluid samples based on γ-Fe 2 O 3 -Fe 2 O 3 . 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 H 2 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. Copyright EDP Sciences, Springer-Verlag 1998

Suggested Citation

  • E. Hasmonay & E. Dubois & J.-C. Bacri & R. Perzynski & Y.L. Raikher & V.I. Stepanov, 1998. "Static magneto-optical birefringence of size-sorted γ-Fe 2 O 3 nanoparticles," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 5(4), pages 859-867, November.
    • Handle: RePEc:spr:eurphb:v:5:y:1998:i:4:p:859-867:10.1007/s100510050512
    DOI: 10.1007/s100510050512
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