Abstract
Maghemite magnetic fluids were investigated by x-ray diffraction, revealing a particle size of 4.8nm with static magnetic birefringence. The effect of nanoparticle concentration on the magneto-optical properties of the system was investigated under low and high laser power conditions. Our results suggest that low power experiments should be used to obtain the correct particle size dispersity. In addition, we found that the mean agglomerate size increases along with particle volume fraction. However, unexpectedly, the mean agglomerate size only agrees qualitatively with the theoretical model, suggesting that other interaction terms, besides the dipolar one, should be included in the theoretical calculation.
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