Abstract
Magnetic properties of colloidal suspensions of γ-Fe 2O 3 particles, obtained through a chemical synthesis, are investigated. Using an optical technique it is verified that these ionic aqueous ferrofluids are stable in high fields. The magnetization saturation of the particles is found independent of their size. Electron microscopy, magnetization and birefringence measurements allow us to separate the two superparamagnetic processes existing in such ferrofluid solutions: Bulk and Néel rotations. The Néel process is investigated through remanent magnetization of frozen solution.
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