Perpendicular recording CoPtCrO composite media with performance enhancement capping layer

Magnetic anisotropy and stacking faults in Co and Co84Pt16 epitaxially grown thin films

“…[1][2][3] The recording layer of today's media is comprised of, at least, two hexagonal close-packed (HCP) CoPt-based layers: a granular layer having CoPt grains segregated by oxide grain boundaries and a capping layer that is continuous and serves to provide uniform intergranular exchange coupling. 4 These layers are grown on an HCP Ru(00.1) underlayer, which serves as a template to transfer HCP stacking to the CoPt layers, induce strong (00.1) texture, and reduce grain size. Stacking faults in HCP Co-alloy media have been previously studied for their potentially detrimental effect on media performance.…”

Designing magnetics of capped perpendicular media with minor-loop analysis

“…Since CoCrPt-oxide composite granular layers were developed [4], many experiments on capped media have used CoCrPt-oxide granular layers in combination with various capping layers, such as CoCrPt alloys, amorphous TbFeCo alloys, and (Co/Pd) n multilayers [5][6][7]. Although these have demonstrated superior recording capabilities under several optimum conditions of the capping layer, the requirements and reasons for the improved performance are still unclear.…”

Comparison of media properties between hard/soft stacked composite and capping layer perpendicular recording media

“…In current capping layer (CL) [2,3] and coupled granular/continuous (CGC) media [4], higher intergranular exchange coupling constant (A ex ) in a top magnetic layer improved the signal-to-noise ratio (SNR) and thermal stability. However, the increase in A ex also increased magnetic write width (MWW) and transition noise, which limit areal density.…”