Magnetic Writer Dual Side Gap for High Density Writability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic recording transducers experience reduced write field and increased wide area track erasure at higher recording densities, leading to performance issues due to scaled-down main pole and side gap sizes, and reduced side shield depth.
Innovation Solution
The implementation of a dual side gap configuration with conformal side gaps of varying widths and throat heights, including a narrower first side gap near the air-bearing surface and a wider second side gap recessed from the surface, along with a plateau to cover the width difference, enhances writability and addresses wide area track erasure and adjacent track interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the main pole and side gap are scaled down to achieve higher recording densities, then the areal density increases, but the write field is reduced
Solution Approach 1:
The side gap is divided into two distinct regions with different properties: a first side gap region with a first gap width and a second side gap region with a second gap width. This local differentiation allows the transducer to maintain appropriate gap dimensions at different locations, preserving write field strength while accommodating higher areal density requirements through optimized local geometry.
2Quantity of substance
If the side shield depth is reduced to achieve higher recording densities, then the areal density increases, but the wide area track erasure increases
Solution Approach 1:
The side gap is configured with different gap widths at different depths from the air-bearing surface. The first side gap region extends deeper than the second side gap region, creating a non-uniform gap structure that locally optimizes flux distribution. This prevents excessive flux leakage that would cause wide area track erasure while maintaining the scaled-down dimensions necessary for high areal density.
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 improves the transducer's performance at higher areal densities by maintaining narrower track widths and enhancing flux shunting, thereby addressing performance limitations at higher recording densities.
Implementation Method 1
enhances writability and addresses wide area track erasure and adjacent track interference
Data Source
AI summary
A magnetic transducer has air-bearing surface (ABS) and includes a main pole, at least one coil, a side shield and a side gap. The coil(s) energize the main pole. A portion of the main pole resides at the ABS. The side gap is between the main pole and the side shield. The side gap is nonmagnetic and includes a first side gap and a second side gap. The first side gap is conformal with the main pole. The second side gap is conformal with the main pole. The first side gap is between the second side gap and the ABS. The second side gap is wider than the first side gap.