Writer with HMTS (high moment trailing shield) aligned with spin layer
AssigneeHeadway Technologies, Inc.
InventorsYuhui Tang, Ying Liu
Life of this patent
Estimating the term…
Abstract
A PMR (perpendicular magnetic recording) write head configured for microwave assisted magnetic recording (MAMR) includes a spin-torque oscillator (STO) and trailing shield formed of high moment magnetic material (HMTS). By patterning the STO and the HMTS in a simultaneous process the HMTS and the STO layer are precisely aligned and have very similar cross-track widths. In addition, the write gap at an off-center location has a thickness that is independent from its center-track thickness and the write gap total width can have a flexible range whose minimum value is the same width as the STO width.
Claims7
A method of fabricating a PMR magnetic writer that is configured for microwave assisted magnetic recording (MAMR), comprising:
- providing a dielectric layer having a planar trailing-edge surface, an air-bearing surface (ABS) plane perpendicular to said planar trailing-edge surface and a trapezoidal trench formed symmetrically therein through said planar trailing-edge surface, projecting rearward in a direction perpendicular to said ABS plane and opening at said ABS plane;
- wherein said trench is wider at said planar trailing-edge surface and tapers downward to form a narrower leading edge;
- and
- a main magnetic pole (MP) emerging through said trench, said MP having a trapezoidal planar ABS face symmetrically positioned within said trench at said air-bearing surface (ABS) plane, wherein said MP face is separated from walls of said trench by symmetrically placed side gaps (SG) and a leading-edge gap (LG);
- and
- a uniformly thick spin torque oscillator (STO) layer formed contiguous with said planar trailing-edge surface of said dielectric layer, wherein said STO layer covers said planar upper surface, covers openings of said SGs and covers a trailing-edge surface of said MP;
- then
- forming a uniformly thick, high moment trailing shield (HMTS) layer contiguously over said STO layer;
- then
- trimming said HMTS and said STO layers in a single trimming process so that said two layers are aligned with each other and have equal widths that are equal to the trailing edge width of said MP;
- then
- forming a write gap (WG) layer extending symmetrically from each side of said trimmed HMTS and STO layers, said WG layer thereby covering at least a portion of said planar trailing-edge surface of said dielectric layer and completely covering said SGs where they emerge at said dielectric layer at each side of said trench opening;
- then
- laterally trimming said WG layer to a final width;
- forming a trailing shield around the fabrication of material whose Bs is less than that of said HMTS.
Dependencies are inferred from the claim text.