Writer with narrower high moment trailing shield
AssigneeHeadway Technologies, Inc.
InventorsYuhui Tang, Ying Liu
Life of this patent
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Abstract
A PMR (perpendicular magnetic recording) write head configured for microwave assisted magnetic recording (MAMR) in the form of spin assisted writing (SAW) or spin torque oscillation (STO) includes a spin-torque oscillator (STO) or SAW device and trailing shield formed of high moment magnetic material (HMTS). By patterning the STO or SAW and the HMTS in a simultaneous process the HMTS and the STO or SAW layers 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 or SAW width.
Claims11
A perpendicular magnetic writer (PMR) configured for spin assisted magnetic writing (SAW), comprising:
- a magnetic main pole (MP) emerging at an air-bearing surface (ABS) and having a trapezoidal ABS face that is wider at a trailing edge surface than at a leading-edge surface and wherein said trailing and leading-edge surfaces are connected by symmetrically formed side edge surfaces;
- a dielectric layer conformally surrounding said MP and forming a uniform gap adjacent to both side edge surfaces of said MP and said leading edge surface of said MP;
- wherein
- said dielectric layer has an upper planar surface that is coplanar with said trailing edge surface of said MP and that extends symmetrically away from said MP from said uniform gaps;
- a spin-assisted writing device (SAW) formed on the trailing edge side of said MP and having the same width as said trailing edge side and aligned with it;
- wherein
- said SAW is configured to provide a magnetization opposite to the direction of a gap field and, thereby, enhances the magnetic field of said MP when said magnetic field is impinging on an adjacent recording media;
- a high-moment trailing shield (HMTS) formed on said SAW and having the same width of said SAW and aligned with it;
- a write gap (WG) layer formed on said upper planar surface of said dielectric layer and having a uniform thickness, said layer extending symmetrically from contiguity with left and right edges of the combined SAW and HMTS.
Dependencies are inferred from the claim text.