FePt:C films were prepared by filtered vacuum arc deposition. A strong
dependence of coercivity and ordering of the face-central tetragonal
structure on both C concentration and annealing temperature was observed.
With C concentration of 21%, the sample with a coercivity of 5.7 kOe was
obtained when annealing temperature was only 350 °C. Transmission
electron microscope observations revealed that FePt grains with an average
size of 4.1 nm were embedded in C and appeared to be well isolated.