NiP seed layer effect on Co/Pd{sub}n/Pd/(NiP)/FeCoC perpendicular recording media for extremely high areal density

摘要

The effect of NiP as seed layer for the Co/Pd{sub}n multilayer perpendicular recording media with a new proposed FeCoC soft underlayer was studied. It was found that a thin layer of 2 nm NiP inserted between the FeCoC soft magnetic underlayer and the Co/Pd{sub}n recording layer improved the magnetic properties such as coercivity, squareness and nucleation field. These improvements may be due to the enhanced grain isolation promoted by NiP seed layer, as well as the lower surface roughness of NiP seed layer. Read/wire test was performed using a ring type head by a Guzik spin stand. The magnetic patterns recorded up to 390 kFCI for Co/Pd{sub}n media with NiP seed layer can be observed clearly by magnetic force microscope images.