Abstract
We report (FePt)Ag–C granular thin films for potential applications to ultrahigh density perpendicular recording media, that were processed by co-sputtering FePt, Ag, and C targets on MgO underlayer deposited on thermally oxidized Si substrates. (FePt) 1− x Ag x – yvol%C (0< x<0.2, 0< y<50) films were fabricated on oxidized silicon substrates with a 10 nm MgO interlayer at 450 oC. We found that the Ag additions improved the L1 0 ordering and the granular structure of the FePt–C films with the perpendicular coercivity ranging from 26 to 37 kOe for the particle size of 5–8 nm. The (FePt) 0.9Ag 0.1–50vol%C film showed the optimal magnetic properties as well as an appropriate granular morphology for recording media, i.e., average grain size of D av =6.1 nm with the standard deviation of 1.8 nm.
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