Perpendicular magnetic recording disk having a permeability gradient

摘要

Perpendicular magnetic recording disks and methods of fabricating perpendicular magnetic recording disks are described. The perpendicular magnetic recording disk includes a soft magnetic underlayer (SUL) structure, an interlayer, and a perpendicular magnetic recording layer. The SUL structure has an increased permeability from an inner radius of the disk to an outer radius of the disk. As a result, the magnetic write width (MWW) on the tracks of the disk is substantially uniform throughout the disk.

主权项

1. A perpendicular magnetic recording disk, comprising:
a soft magnetic underlayer (SUL); an interlayer on the SUL; and a perpendicular magnetic recording layer on the interlayer; wherein the SUL has an increased permeability from an inner radius of the disk to an outer radius of the disk.