Abstract
Magnetic birefringence experiments under static eld are performed on ionic ferrofluid samples based on 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 H 2 in the low eld limit. In the high eld limit the particles size dependence of the saturation birefringence is compatible with a surface anisotropy constant KS =2 : 810 2 erg cm 2 associated with a particle elongation of 1.25 both coherent with N eel predictions of surface anisotropy in small grains.
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