Abstract
Both pure Fe 3 O 4 magnetic fluids and containing polystyrene sphere composite magnetic fluids have been prepared. The magneto-optical characteristics such as magnetic birefringence and linear dichroism of both magnetic fluids and composite magnetic fluids have been investigated by the magneto-optically modulated double-frequency method. The results reveal that the order structure of nonmagnetic spheres and the interactions between the spheres and the neighbor magnetic chains of Fe 3 O 4 particles in the composite magnetic fluids strongly affect the magneto-optical properties. The magneto-optical properties from the study can be used for further development of related new optical devices.
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