| Abstract
| - Monodisperse Fe3O4 nanoparticles (NPs) with narrow size distribution are synthesized by a high-temperaturesolution-phase method. The diameter of the as-synthesized NPs is tuned from 2 to 14 nm by varying thereaction conditions. Highly ordered superlattice structures of the Fe3O4 NPs with areas extending over0.8 μm × 0.7 μm have been successfully obtained. The magnetic properties are investigated in their differentstates, such as in the solid state and diluted in wax with different concentrations. Some magnetic propertiesenhanced by increasing interparticle distances, such as the remanent magnetization and coercive field at lowtemperature, were noticed. Furthermore, we also observed that the saturation magnetization changed withtemperature as expected. The preliminary explanation for the properties mentioned above is proposed.
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