Abstract
Co-C nanocomposite thin films with a Co atomic content of 13.0% were fabricated onto Si (100) substrates by magnetron co-sputtering technique. Post annealing was carried out in vacuum at annealing temperature ranging from 473 K to 773 K for 30 min. TEM images indicate that the Co nanoparticles are dispersed uniformly in an amorphous carbon matrix for the as-deposited samples, and Co particle size is in a range of 1.5—3.0 nm. After annealing at 673 K, the average Co particle size is enlarged distinctly. Magnetization hysteresis loops reveal that the as-deposited thin films show low magnetization. As annealing temperature is increased, both magnetization and coercivity are enhanced significantly. The samples annealed at 673 K and 773 K show ferro- magnetic behaviors at low temperature, and superparamagnetic behaviors at room temperature, which are characteristic magnetic features for granular system. A negative magnetoresistance (MR) of 1.33% is observed for the as-deposited Co-C thin films at 4.2 K in the applied magnetic field
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