Patent ID: 8867157

Claim:
A perpendicular write head, comprising: a primary write head configured to generate a magnetic field approximately perpendicular to a surface of the primary write head; a plurality of flux concentrators disposed on and protruding from the surface of the primary write head, the flux concentrators configured to concentrate the magnetic field in a servo pattern; and a nonmagnetic cover material disposed on the surface of the primary write head in contact with a magnetic medium, the nonmagnetic cover material defining a plurality of holes through which the flux concentrators are positioned such that an outer surface of each flux concentrator is approximately flush with an outer surface of the nonmagnetic cover material; wherein the magnetic field is concentrated in the magnetic medium by the flux concentrators such that the concentrated magnetic field is greater than 110% of a coercivity of the magnetic medium, and wherein an unconcentrated magnetic field generated by the primary write head is less than 90% of the coercivity of the magnetic medium, absent the flux concentrators.