We report (FePt)AgC 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-xAgxyvol%C (0<x<0.2, 0<y<50) films were fabricated on oxidized silicon substrates with a 10 nm MgO interlayer at 450oC. We found that the Ag additions improved the L10 ordering and the granular structure of the FePtC films with the perpendicular coercivity ranging from 26 to 37 kOe for the particle size of 58 nm. The (FePt)0.9Ag0.150vol%C film showed the optimal magnetic properties as well as an appropriate granular morphology for recording media, i.e., average grain size of Dav=6.1 nm with the standard deviation of 1.8 nm.
ASJC Scopus subject areas