Abstract
CoPt nanoparticles with various Ag contents were synthesized by sol–gel technique. L10 CoPt alloy phase was formed after annealing at 700 °C. The coercivity (Hc) increased when the Ag content increased from 0 to 15 at.%. And Hc decreased when the Ag content was over 15 at.%. A certain amount of Ag could enhance the ordering degree of CoPt nanoparticles and improve the magnetic properties. When the Ag addition was more than 15 at.%, the deteriorated magnetic properties were ascribed to the decrease of ordering degree.
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