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US 9,025,280 B2Granted
PMR writer device with multi-level tapered write pole
AssigneeHeadway Technologies, Inc.
InventorsZhigang Bai, Kowang Liu, Yan Wu, Moris Dovek
Life of this patent
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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.
Claims9
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 said main pole has a region of constant main pole thickness extending in said positive y-direction thereafter;
- and
- first and second tapered yokes, each having a 2nd taper, wherein said first 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 of said bottom yoke is directed towards a leading edge surface of said bottom yoke and is defined by a region of increasing first yoke thickness of said first yoke in said positive y-direction, said region of increasing first yoke thickness beginning at a first 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 first yoke thickness becomes a region of constant first yoke thickness thereafter;
- and wherein
- said second tapered yoke is a top yoke formed on said trailing edge surface of said region of constant thickness of said main pole and wherein said 2nd taper of said top yoke is marked by a slope towards a trailing edge surface of said top yoke and a corresponding increasing second yoke thickness in a positive y-direction wherein said increasing second yoke thickness begins at a second yoke edge of said second yoke closest to said ABS edge;
- wherein said first and second yoke edges closest to said ABS edge of said main pole contact said region of constant main pole thickness of said main pole and are recessed a distance from said ABS edge.
3 more elements
A PMR head comprising:
- a main pole having a trailing edge surface and a leading edge surface and having a 1st taper formed symmetrically about a mid-line on both said trailing edge surface and 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 said main pole has a region of constant main pole thickness extending in said positive y-direction thereafter to a point of termination;
- a pair of tapered yokes, each having a 2nd taper, stitched symmetrically on said leading edge surface and said trailing edge surface of said region of constant main pole thickness of said main pole and extending in a positive y-direction beyond said main pole, wherein said 2nd taper of each yoke is directed towards said main pole 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 region of constant yoke thickness extends beyond the termination point of said main pole;
- 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.
1 more element
Dependencies are inferred from the claim text.