Varied Sidewall Write Pole for Magnetic Recording Heads
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Solution Overview
Problem
Magnetic recording heads face challenges in maximizing write field strength while minimizing undesirable erasure fields, particularly in perpendicular magnetic recording systems, where existing write pole designs often compromise between tracks per inch (TPI) and bits per inch (BPI).
Innovation Solution
A write head with a write pole tip featuring a varied sidewall shape, transitioning from a straight-line or trapezoidal shape at the bearing surface to a multi-segment or curved shape towards the rear end, optimizing the wall angle and profile to enhance write field strength with reduced erasure fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a write pole design is used to maximize write field strength, then write field strength is improved, but undesirable erasure fields increase
Solution Approach 1:
The write pole is designed with non-uniform sidewall shapes at different locations: a first sidewall shape at the pole tip region and a second sidewall shape at the rear end region. This local differentiation allows the pole tip to generate strong write fields while the rear portion controls erasure field distribution, resolving the contradiction between write field strength and erasure field reduction
Solution Approach 2:
The write pole sidewall is segmented into distinct regions with different geometries. The first sidewall shape (e.g., tapered or angled) optimizes flux concentration at the pole tip for high write field strength, while the second sidewall shape (e.g., curved or flared) modifies the flux distribution at the rear to minimize erasure fields, effectively dividing the pole into functional zones
2Manufacturing precision
If write pole design is optimized for high write field strength, then bits per inch (BPI) is improved, but tracks per inch (TPI) deteriorates
Solution Approach 1:
Different sidewall shapes are applied to different longitudinal sections of the write pole. The first sidewall shape at the pole tip concentrates flux for high BPI, while the second sidewall shape at the rear controls lateral flux spread to improve TPI, allowing simultaneous optimization of both recording parameters
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 achieves high write field strengths with low undesirable erasure fields, improving both TPI and BPI, thereby increasing data storage density and writeability.
Implementation Method 1
Current is supplied to write coils to induce a flux path in the write pole to record data on one or more magnetic storage layers of the media
Data Source
AI summary
A write head having a write pole tip. The write pole tip includes a bearing surface and a sidewall extending from the bearing surface to a rear end of the write pole tip. The sidewall has a first shape (e.g., a straight-line sidewall shape) substantially at the bearing surface and a second shape (e.g., a multi-segment sidewall shape or a curved sidewall shape) between the bearing surface and the rear end.