FePt perpendicular recording media with Ag layer inserted

Samples with the structure of FePt(5 nm)/Ag(t nm)/FePt(5 nm) were deposited on Pt(4 nm)/Cr/sub 90/Ru/sub 10/(30 nm) underlayers. The inserted Ag thickness t varied in the range of 0 /spl sim/ 2 nm. The substrates were preheated to 350/spl deg/C prior to deposition and this temperature was maintained during deposition. The chamber base pressure was better than 3/spl times/10/sup -8/ Torr. All the samples showed perpendicular texture and magnetic anisotropy. The coercivity increased with increasing Ag thickness and the curve slope at the coercive field was decreased, indicating the decrease of magnetic exchange coupling.