Stepped Conformal Trailing Shield for Magnetic Write Apparatus
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Solution Overview
Problem
Conventional magnetic recording write apparatuses face challenges in achieving high recording densities due to wide area track erasure issues, where the magnetic field from the pole during writing disturbs data on other tracks, leading to performance limitations.
Innovation Solution
The design incorporates a pole with a beveled trailing surface and a trailing shield with varying thicknesses in the write gap, maintaining a constant width near the air-bearing surface to reduce field shunting and minimize disturbances to adjacent tracks, thereby enhancing recording performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional trailing shield design is used, then the structure is simple, but wide area track erasure increases and recording density performance deteriorates
Solution Approach 1:
The trailing shield is designed with non-uniform thickness, being thicker near the air-bearing surface and thinner toward the trailing end. This local variation in shield thickness optimizes the magnetic field distribution to reduce wide area track erasure while maintaining recording density performance.
Solution Approach 2:
The shield thickness is varied in the vertical dimension (perpendicular to the air-bearing surface) rather than only in the horizontal dimension. This three-dimensional configuration allows precise control over field shunting and track erasure characteristics.
2Object-generated harmful factors
If the trailing shield thickness is increased, then field shunting is reduced, but the device complexity increases
Solution Approach 1:
Rather than uniformly increasing the entire shield thickness, the invention locally increases the shield thickness only in the region near the air-bearing surface where field shunting is most problematic. This targeted approach reduces field shunting while minimizing overall structural complexity.
Solution Approach 2:
The shield thickness parameter is varied continuously through the write gap, creating an optimized profile that balances field shunting reduction with manufacturing feasibility. The thickness transitions from a first value near the air-bearing surface to a second value at the trailing end.
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 configuration maintains a consistent magnetic field strength while reducing wide area track erasure issues, improving the overall performance of the magnetic recording apparatus by effectively shielding other tracks from the write field.
Implementation Method 1
maintains a constant width near the air-bearing surface to reduce field shunting
Implementation Method 2
effectively shielding other tracks from the write field
Data Source
AI summary
A magnetic write apparatus has a media-facing surface (MFS), a pole having leading and trailing surfaces, a trailing shield having a pole-facing surface, a write gap and coil(s). The pole's trailing surface has a portion adjoining the MFS and oriented at a nonzero, acute bevel angle from a direction perpendicular to the MFS. The pole-facing surface includes a first portion adjoining the MFS and oriented at a first angle substantially the same as the bevel angle, a second portion oriented at a second angle greater than the first trailing shield angle, and a third portion oriented at a third angle substantially the same as the first angle. The write gap has first, second and third thicknesses adjacent to the first, second and third portions of the pole-facing surface, respectively. The first thickness is constant. The second thickness varies. The third thickness is constant and greater than the first thickness.