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We present the magnetic properties and the material characteristics of magnetite (Fe3O4), which was successfully prepared by using the reaction of iron(III) acetylacetonate [Fe(acac)3] with surfactants at high temperature (so called by "high temperature decomposition method"). According to the results of high resolution transmission electron microscopy (HRTEM) analysis, the prepared iron oxide particles had the average particle sizes between 4 and 6 nm and very uniform size distributions. The crystal structure analyzed by using both XRD and Mössbauer spectra confirmed that the prepared iron oxide nanoparticles only have single magnetite (Fe3O4) crystal phase. The typical superparamagnetic behaviors were observed from the prepared iron-oxide nanoparticles. In addition, they showed the saturation magnetization, MS of 59.5 emu/g for 4 nm, and of 59.7 emu/g for 6 nm, respectively at room temperature under the externally applied magnetic field of 10 kOe. The measured Mössbauer spectrum at 4.2 K was fitted using two magnetic components: (1) hyperfine fields Hhf=514 and 492 kOe, (2) isomer shifts δ=0.35 and 0.73 mm/s. The fitted data apparently verified that the prepared iron oxide samples only have pure magnetite ([Fe3+]A [Fe2+Fe3+]BO4).