CoPt-C nanocomposite thin films of various carbon compositions were prepared by a pulsed filtered vacuum arc deposition technique. Annealing was performed in vacuum for one hour at various temperatures. The dependence of the magnetic properties on the carbon composition and annealing temperature was studied. Both x-ray diffraction and magnetic force microscopy analyses confirmed the formation of nano-crystallites of face-centered-tetragonal CoPt phase in the carbon matrix after annealing at a sufficiently high temperature, depending on the carbon composition. For the film with a particular composition of Co{sub}24Pt{sub}31C{sub}45, the coercivity and the grain size were observed to increase with increasing annealing temperature, up to a value of 7 kOe at an annealing temperature of 750℃, and the grain size increased from 9 to 20 nm.
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