PMR Head Stitch Layer for Flux Transfer
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Solution Overview
Problem
Conventional perpendicular magnetic recording (PMR) heads experience reduced write efficiency at higher densities due to the thickness of poles and the distance between the PMR pole and the shield, which affects the transfer of magnetic flux.
Innovation Solution
Incorporating a stitch between the PMR pole and an additional pole, with the stitch being recessed from the air-bearing surface and having a thin, magnetic structure that aids in flux transfer, allowing for improved writeability even at reduced pole thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the P226 is spaced at least one micron from the back of the shield portion 32A to ensure sufficient fabrication process margins, then manufacturability is improved, but write efficiency deteriorates at higher densities
Solution Approach 1:
The patent introduces a stitch layer as an intermediary magnetic structure between the P226 and the shield portion. This stitch layer has a front surface that is recessed from the ABS and provides a magnetic flux transfer path, enabling the P226 to be positioned closer to the shield while maintaining adequate process margins. The stitch acts as a mediator that improves write efficiency by enhancing flux transfer without compromising manufacturability.
2Manufacturing precision
If the thickness of the poles 24 and 26 is reduced to scale to higher densities, then storage density is improved, but write efficiency deteriorates due to insufficient flux transfer
Solution Approach 1:
The stitch layer serves as a magnetic intermediary that enhances flux transfer from the PMR pole through the reduced-thickness P226 to the shield. By providing this intermediate magnetic path, the system can maintain adequate flux transfer even when the pole thickness is reduced for higher density applications.
Solution Approach 2:
The patent addresses the thickness limitation by introducing a spatial dimension - the stitch layer with its recessed front surface creates a three-dimensional flux path. This dimensional approach allows flux transfer to occur effectively even when the vertical thickness of the poles is reduced, enabling higher density scaling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances write efficiency and performance of the PMR head at higher densities without compromising manufacturability, as the stitch is closer to the air-bearing surface than the additional pole, improving flux transfer and maintaining process margins.
Implementation Method 1
The stitch resides between the PMR pole and the additional pole and has a stitch front portion between the front portion of the PMR pole and the additional pole. At least a portion of the write gap resides on the front portion of the PMR pole. At least a portion of the additional pole resides between the PMR pole and the shield.
Implementation Method 2
at least one coil that energizes at least the additional pole
Data Source
AI summary
A method and system for providing a magnetic transducer having an air-bearing surface (ABS) are described. The magnetic transducer includes a perpendicular magnetic recording (PMR) pole, an additional pole, a stitch, a shield, a write gap between the PMR pole and a portion of the shield, and at least one coil that energizes at least the additional pole. The PMR pole has a first front portion proximate to the ABS, while the additional pole is recessed from the ABS. The stitch resides between the PMR pole and the additional pole and has a stitch front portion between the front portion of the PMR pole and the additional pole. At least a portion of the write gap resides on the front portion of the PMR pole. At least a portion of the additional pole resides between the PMR pole and the shield.