PMR Writer Device with Multi-Level Tapered Write Pole

摘要

A perpendicular magnetic recording (PMR) head is fabricated with a multi-level tapered write pole. The write pole comprises a main pole with a tapered tip on a leading edge or a trailing edge, on which is formed at least one yoke that has a tapered edge. The edge of the yoke is recessed from the ABS of the main pole, giving the head a stepped profile. The yoke can be a single yoke formed on one side of the main pole or it can be two yokes formed on both the leading and trailing sides of the main pole. The write pole structure creates an efficient channeling of magnetic flux to the ABS surface of the pole tip which produces magnetic recording field at high area densities.

主权项

1. A PMR head comprising:
a main pole having a trailing edge surface and a leading edge surface and having a 1st taper on either said trailing edge surface or on said leading edge surface, wherein said 1st taper is defined by a region of increasing main pole thickness in a positive y-direction away from an ABS edge of said main pole, wherein said ABS edge is flat and wherein said taper terminates and wherein said main pole has a region of constant main pole thickness extending in said positive y-direction thereafter; at least one tapered yoke having a 2nd taper, wherein said at least one tapered yoke is a bottom yoke formed conformally on said leading edge surface of said region of constant main pole thickness of said main pole, wherein said 2nd taper is directed towards a leading edge surface of said bottom yoke and is defined by a region of increasing yoke thickness of said yoke in said positive y-direction, said region of increasing yoke thickness beginning at a yoke edge closest to said ABS edge of said main pole and increasing in a direction away from said ABS edge until said region of increasing yoke thickness becomes a region of constant yoke thickness thereafter; and wherein said yoke edge closest to said ABS edge of said main pole contacts said region of constant main pole thickness of said main pole and is recessed a distance from said ABS edge.