Patent ID: 8252153

Claim:
A method for making a patterned-media perpendicular magnetic recording disk comprising: providing a substrate having a generally planar surface and a plurality of data pillars and a plurality of nondata servo pillars extending generally perpendicularly from said substrate surface, the data pillars arranged in generally concentric circular tracks and spaced-apart to define data trenches at said substrate surface between the data pillars, the height of the data pillars above the substrate surface being greater than or equal to the spacing between the data pillars on the substrate surface, the nondata servo pillars arranged in angularly-spaced nondata servo sectors extending generally radially across the tracks and spaced apart to define servo trenches at said substrate surface between the servo pillars, the spacing between the servo pillars on the substrate surface being greater than the height of the servo pillars above the substrate surface; sputter depositing on the substrate surface magnetizable material selected from the group consisting of (a) a multilayer of alternating layers of a first material and a second material, said first material/second material multilayer selected from the group consisting of Co/Ni, Co/Pt, Co/Pd, Fe/Pt, Fe/Pd, CoFe/Pt, CoFe/Pd, CoNi/Pt, CoNi/Pd, FeNi/Pt and FeNi/Pd, said multilayer having perpendicular magnetic anisotropy, (b) a binary alloy selected from CoPt, CoPd, FePt, FePd, CoPt 3 , Co 3 Pt, CoPd 3 and Co 3 Pd, and (c) an alloy selected from (Co (y) Pt (100-y) )—X and (Fe (y) Pt (100-y) )—X, where y is between about 45 and 55 atomic percent and the element X is selected from the group consisting of Ni, Au, Cu, Pd and Ag and is present in an amount greater than zero atomic percent and less than or equal to 20 atomic percent; applying a first magnetic field in a first direction perpendicular to the substrate surface to magnetize said multilayer on the data pillars and servo pillars and in the servo trenches in the same perpendicular direction; and applying a second magnetic field less than the first magnetic field in a second direction perpendicular to the substrate surface and opposite said first direction to reverse the magnetization of said multilayer in the servo trenches without reversing the magnetization of said multilayer on the data pillars and servo pillars.