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

E. Hasmonay, E. Dubois, J.-C. Bacri, R. Perzynski, Y.L. Raikher and V.I. Stepanov

The European Physical Journal B: Condensed Matter and Complex Systems, 1998, vol. 5, issue 4, 859-867

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

Keywords: PACS. 75.50.Mm Magnetic liquids - 78.20.Ls Magnetooptical effects - 78.66.J Nanocrystalline materials; optical properties (search for similar items in EconPapers)
Date: 1998
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DOI: 10.1007/s100510050512

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