Dual Writer Interlaced Magnetic Recording Head Design
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Solution Overview
Problem
In interlaced magnetic recording (IMR) systems, achieving high areal density capacity (ADC) is challenging due to the need for strong write fields that can affect adjacent cell polarization, leading to overwriting issues, and optimizing wide and narrow writer designs simultaneously to maximize on-track gain is difficult.
Innovation Solution
A dual writer system with two writers, one having a wider write pole and the other a narrower one, both with similar front and side shield gaps, optimizing write pole widths and shield gaps to enhance on-track performance and prevent adjacent track interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single writer with a wide write pole is used to increase areal density capacity, then bits per inch (BPI) improves, but adjacent track interference increases and pole saturation risk increases
Solution Approach 1:
The single writer is segmented into two separate writers: a first writer with a first write pole width optimized for writing to first data tracks, and a second writer with a second write pole width optimized for writing to second data tracks. This segmentation allows each writer to be optimized for its specific track set, achieving high areal density capacity while preventing adjacent track interference through controlled field confinement.
Solution Approach 2:
Each writer is given locally optimized properties: the first writer has a first write pole width specifically tailored for first data tracks, and the second writer has a second write pole width specifically tailored for second data tracks. This local quality optimization ensures that each writer generates the appropriate field gradient and transition curvature for its target tracks without affecting adjacent tracks unnecessarily.
2Manufacturing precision
If the write pole width is increased to enhance field gradient and transition curvature, then on-track performance improves, but the risk of pole saturation increases
Solution Approach 1:
The write pole width parameter is changed and optimized for each writer based on its specific function. The first writer has a first write pole width optimized for writing to first data tracks, while the second writer has a second write pole width optimized for second data tracks. This parameter optimization allows each writer to achieve the necessary field gradient and transition curvature for high on-track performance while maintaining reliability by avoiding pole saturation through appropriate width selection.
3Productivity
If different write pole widths are used for different track series, then on-track gain is maximized, but device complexity increases
Solution Approach 1:
The first writer and second writer are merged into a single transducer head assembly, sharing common structural elements such as the substrate, suspension, and air bearing surface. This merging approach maximizes on-track gain through optimized write pole widths for each track series while minimizing device complexity by consolidating shared components and reducing the overall number of independent elements.
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
The dual writer system improves areal density capacity by enhancing bits per inch (BPI) through better transition curvature and field gradient, while minimizing the risk of pole saturation and adjacent track interference, thus achieving optimized on-track performance.
Implementation Method 1
each writer including a write pole
Implementation Method 2
a strong write field is needed to shift the polarity of cells on a magnetized medium
Implementation Method 3
down-track width of a front shield gap of the first write pole is substantially similar to down-track width of a front shield gap of the second write pole
Data Source
AI summary
The disclosed technology includes a storage device including an interlaced magnetic recording (IMR) system, and a transducer head, including two writers, each writer including a write pole, wherein a width of a first write pole in a cross-track direction is substantially greater than a width of a second write pole in the cross-track direction, and wherein a down-track width of a front shield gap of the first write pole is substantially similar to down-track width of a front shield gap of the second write pole. In another implementation, the storage device includes an IMR system, and a transducer head, including two writers, each writer including a write pole, wherein a width of the first write pole in a cross-track direction is substantially greater than a width of a second write pole in a cross-track direction, and wherein a cross-track width of a side shield gap of the first write pole is substantially similar to a cross-track width of a side shield gap of the second write pole.