PMR writer device with multi-level tapered write pole
AssigneeHeadway Technologies, Inc.
InventorsZhigang Bai, Kowang Liu, Yan Wu, Moris Dovek
Life of this patent
Estimating the term…
Abstract
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.
Claims5
A PMR head comprising:
- a main pole having a trailing edge surface and a leading edge surface and having a 1st taper on either or both said trailing edge surface and said leading edge surface, wherein said 1st taper is defined on either or both said trailing edge surface and said leading edge surface by a region of increasing main pole thickness in a positive y-direction away from an ABS edge of said main pole, whereupon said 1st taper terminates and said main pole has a region of constant main pole thickness, whereat said trailing edge and leading edge surfaces are parallel, extending in said positive y-direction thereafter;
- at least one tapered yoke having a 2nd taper, wherein said at least one tapered yoke is formed conformally on a trailing or leading edge surface of said region of constant main pole thickness of said main pole, wherein said 2nd taper 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 is characterized by a yoke edge face that is parallel to said ABS edge of said main pole and wherein said yoke edge contacts said region of constant main pole thickness of said main pole and is recessed a distance from said ABS edge.
Dependencies are inferred from the claim text.