Abstract
Co nanoparticles embedded in a carbon matrix have been prepared by gas condensation using a cluster gun. The magnetic, microstructural, and transport properties of the Co nanoparticles can be controlled by the volume fraction of Co particles, which is adjusted by the sputtering time of Co. With the decrease of the amount of Co, the transport properties of thin films showed a transition from a metallic to a semiconductorlike behavior. The sample with a semiconductorlike behavior showed a superparamagnetic behavior with a blocking temperature around 130K. The blocking temperature of the Co particles was found to decrease with the decrease of Co sputtering time, indicating a decrease in the average particle size because of the shorter sputtering time.
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