Abstract
We report on the magnetic properties of Co-doped (5% and 10% molar) ZnO nanoparticles prepared by the vaporization-condensation method in a solar reactor. X-ray diffraction patterns do not show evidence of Co segregation or any other phase different from wurtzite-type ZnO. High-resolution electron microscopy shows no traces of Co clusters or any other secondary phase. Samples prepared at 70–100Torr inside glass reactors are paramagnetic and the dominant magnetic interactions are antiferromagnetic in nature. Increasing the Co content promotes a reinforcement of the antiferromagnetic interactions. A reduction of the high-temperature effective paramagnetic moment is also observed.
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