Abstract
Magnetization measurements for the Co3O4 nanoparticles were performed. From the X-ray diffraction patterns Co3O4 nanoparticles surrounded by amorphous SiO2 were expected for the samples annealed between 623 and 873 K. Their diameters were estimated to be 2 or 3 nm. DC magnetization curves of zero-field cooled and field-cooled bifurcated around Tt=10 K, while the bulk Co3O4 crystal exhibits antiferromagnetic transition temperature at TN=33 K. Characteristic properties of extremely small Co3O4 nanoparticles were confirmed.
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