Perpendicular Write Head Wrap-Around Shield Gap Design
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Solution Overview
Problem
Perpendicular magnetic recording technologies face challenges in achieving optimal write field strength, minimizing adjacent track interference, and reducing magnetic core width in traditional write heads, which are crucial for improving data rate and capacity.
Innovation Solution
A magnetic write head with a trailing, wrap-around shield structure featuring a side gap that is narrower near the leading edge and wider near the trailing edge of the write pole, optimizing write field strength and reducing adjacent track interference and magnetic core width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional wrap-around shield with uniform side gap is used, then the structure is simple and easy to manufacture, but the write field strength is insufficient and adjacent track interference cannot be minimized
Solution Approach 1:
The shield structure employs different side gap thicknesses at different locations: a first side gap at the leading edge and a second side gap at the trailing edge. This local variation in gap dimensions allows optimization of magnetic flux distribution to enhance write field strength at the trailing edge while controlling adjacent track interference, resolving the contradiction between field strength and structural simplicity.
2Object-affected harmful factors
If a uniform side gap shield structure is used, then manufacturing is easier, but adjacent track interference and magnetic core width are not optimized
Solution Approach 1:
The shield structure employs different side gap thicknesses at different locations: a first side gap at the leading edge and a second side gap at the trailing edge. This local variation in gap dimensions allows optimization of magnetic flux distribution to enhance write field strength at the trailing edge while controlling adjacent track interference, resolving the contradiction between field strength and structural simplicity.
3Object-affected harmful factors
If the side gap is made wider to reduce magnetic core width dependence on skew angle, then adjacent track interference is reduced, but write field strength may be compromised
Solution Approach 1:
The shield structure employs different side gap thicknesses at different locations: a first side gap at the leading edge and a second side gap at the trailing edge. This local variation in gap dimensions allows optimization of magnetic flux distribution to enhance write field strength at the trailing edge while controlling adjacent track interference, resolving the contradiction between field strength and structural simplicity.
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
This design enhances write field strength at the trailing edge while minimizing interference and core width, thereby maximizing the performance of the magnetic write head.
Implementation Method 1
Current conducted to the coil layer induces a magnetic flux in the pole pieces which causes a magnetic field to fringe out at a write gap at the ABS
Implementation Method 2
causes a magnetic field to fringe out at a write gap at the ABS for the purpose of writing the aforementioned magnetic transitions in tracks on the moving media
Data Source
AI summary
A magnetic write head for perpendicular magnetic data recording. The write head includes an wrap around trailing shield structure for improved write field strength, reduced skew related adjacent track interference and magnetic core width. The trailing wrap around shield includes a side shield that is separated from sides of the write pole by a side gap that is narrower near the leading edge of the write pole and wider near the trailing edge of the write pole.