High-Areal Density Recording Simulation of Three-Layered ECC Bit-Patterned Media With a Shielded Planar Head

Magnetic parameters of the previously proposed three-layer exchange coupled composite (ECC) dot were modified to compensate the additional perpendicular anisotropy from the shape and the stacking of the layers. The modification in the magnetic parameters resulted in a minimum switching field and applied field angle dependence of the field. Recording simulation using a multistepped shielded planar head field on the bit-patterned media with modified three-layer ECC dots suggested possibility of a high-areal density recording above 4 T dot/in(2) with no energy assist scheme. It was also concluded that magnetic parameter compensation for additional shape and stacking anisotropy is indispensable for ECC dots.