Graded Bevel Tapered Write Pole for Flux Concentration
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Solution Overview
Problem
Existing perpendicular magnetic writers face challenges in delivering sufficient flux to the air bearing surface (ABS) due to sensitivity to ABS lapping position and processing difficulties with steep tapered write gaps, which affect flux concentration and track width.
Innovation Solution
The solution involves increasing the taper of the section above the write gap without changing the pole taper at the ABS, either by extending it laterally or bringing it closer to the ABS, and forming a non-uniform write gap to reduce flux leakage, while maintaining the same write gap angle and field gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the taper angle θ is increased to enhance flux concentration, then the A2/A1 ratio increases, but the sensitivity of the ABS area to ABS lapping position increases
Solution Approach 1:
The pole is divided into multiple sections with different taper angles: an upper section with a first taper angle and a lower section with a second, smaller taper angle. This segmentation allows each section to serve its specific function - the upper section provides strong flux concentration while the lower section maintains stability against ABS lapping position variations.
Solution Approach 2:
Different portions of the pole are assigned different geometric properties - the upper section has a steeper taper angle for maximum flux concentration, while the lower section has a gentler taper angle for reduced sensitivity to ABS positioning variations. This local differentiation optimizes both flux delivery and manufacturing tolerance.
2Quantity of substance
If a steep tapered write gap is used to increase A2/A1 ratio, then flux concentration improves, but processing difficulty increases
Solution Approach 1:
The pole structure is segmented into upper and lower sections with different taper angles, allowing the upper section to achieve steep tapering for flux concentration while the lower section uses a more manageable angle for manufacturing. This divides the processing complexity across functional zones.
Solution Approach 2:
The taper angle parameter is changed along the length of the pole - steeper in the upper section for flux concentration, gentler in the lower section for manufacturing ease. This parameter variation optimizes both performance and manufacturability.
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 approach enhances flux concentration at the ABS, reducing sensitivity to ABS lapping position variations and improving flux delivery without increasing processing complexity.
Implementation Method 1
increasing the taper of the section above the write gap... enhancing flux concentration at the ABS
Data Source
AI summary
A structure and a process for a perpendicular write pole that provides increased magnetic flux at the ABS is disclosed. This is accomplished by increasing the amount of write flux that originates above the write gap, without changing the pole taper at the ABS. Three embodiment of the invention are discussed.