Graded bevel tapered write pole design for field enhancement

摘要

A structure and a process for a perpendicular write pole that provides increased magnetic flux at the ABS is disclosed. This is accomplished by increasing the amount of write flux that originates above the write gap, without changing the pole taper at the ABS. Three embodiment of the invention are discussed.

主权项

1. A perpendicular magnetic write pole for magnetic recording, having an air bearing surface (ABS), comprising:
a main pole in the form of a magnetic layer of trapezoidal cross-section, having a beveled upper surface terminating at a first planar edge, said first planar edge being coplanar with the ABS; wherein said beveled upper surface comprises a beveled portion making an angle of between about 10 and 45 degrees with the horizontal and extending rearward from said first planar edge and a horizontal portion extending thereafter from said beveled portion; formed contiguously on said magnetic layer, a first non-magnetic layer having a second edge that is coplanar with said first edge; said first non-magnetic layer further comprising a first part that extends from said second edge along said beveled portion of said upper surface of said magnetic layer and a second part, connected to said first part, that lies on said horizontal portion of said upper surface; a second non-magnetic layer formed contiguously on a portion of said first non-magnetic layer, said second non-magnetic layer covering all of said second part and partially covering said first part with the exception of a section of said first part that extends distally for a distance from said first edge and is not covered by said second non-magnetic layer, said second non-magnetic layer having a beveled upper surface substantially parallel with said beveled portion of said upper surface of said magnetic layer; and a trailing shield that extends upwards from contact with said first and second non-magnetic layers, said trailing shield having an edge that is coplanar with said first and second edges, whereby, as a result of said two consecutively formed and contiguous write-gap layers, a write gap exists extending at least between said trailing shield and said main pole that is narrower and thinner at the ABS and wider and thicker away from it, thereby reducing flux leakage from said main pole to said trailing shield and delivering more flux at the ABS.