Asymmetric Shingled Write Head Pole Design
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Solution Overview
Problem
Conventional shingled write heads have a symmetric design that needlessly constrains the magnetic field, leading to reduced writing efficiency due to the constraint between pole width and track width, and most of the initial written data is erased by overlapping tracks, limiting the effectiveness of shingled recording.
Innovation Solution
An asymmetric shingled write head design with a shield extending along only a portion of the trailing edge and first side edge, and not the second side edge, allowing for a different angle between the side edges and trailing edge, which enhances the concentration of the writing pole and minimizes unnecessary overwrite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a symmetric write head design is used, then the magnetic field is distributed evenly, but the field concentration in the corner region is reduced and unnecessary overwrite occurs
Solution Approach 1:
The write head employs an asymmetric pole configuration where the pole width is greater than the track width, with the pole extending beyond the track boundaries. This asymmetric design concentrates the magnetic field in the corner region where it is most effective for writing, while reducing unnecessary field distribution that causes overwrite of subsequent tracks. The asymmetric geometry allows optimization of field concentration without requiring complex manufacturing processes.
Solution Approach 2:
The write head design applies different magnetic field characteristics to different regions of the pole. By making the pole width greater than the track width and positioning the pole such that it extends beyond the track boundaries, the design concentrates field strength locally in the corner region where it matters most for writing efficiency, while allowing the field to naturally decay in other regions to minimize unnecessary overwrite.
2Manufacturing precision
If the pole width is decreased to match narrower tracks, then track precision is improved, but the maximum field magnitude is reduced
Solution Approach 1:
The write head employs an asymmetric pole configuration where the pole width is greater than the track width, with the pole extending beyond the track boundaries. This asymmetric design concentrates the magnetic field in the corner region where it is most effective for writing, while reducing unnecessary field distribution that causes overwrite of subsequent tracks. The asymmetric geometry allows optimization of field concentration without requiring complex manufacturing processes.
Solution Approach 2:
The design changes the geometric parameters of the pole relative to the track width. By making the pole width greater than the track width and adjusting the pole position and dimensions, the system achieves both precise track writing and sufficient field magnitude. The parameter optimization allows the pole to maintain adequate field strength while the asymmetric geometry ensures field concentration in the appropriate region.
3Quantity of substance
If conventional shingled recording is used with overlapping tracks, then storage capacity is increased, but most written data is erased by subsequent overlapping tracks
Solution Approach 1:
The write head employs an asymmetric pole configuration where the pole width is greater than the track width, with the pole extending beyond the track boundaries. This asymmetric design concentrates the magnetic field in the corner region where it is most effective for writing, while reducing unnecessary field distribution that causes overwrite of subsequent tracks. The asymmetric geometry allows optimization of field concentration without requiring complex manufacturing processes.
Solution Approach 2:
The design accepts that some field distribution will cause overwrite of subsequent tracks, but converts this potential harm into a benefit by using the asymmetric pole geometry to concentrate field strength in the corner region where it is most effective for writing. The field distribution that would normally be considered harmful is redirected to serve the primary writing function more effectively.
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 asymmetric design significantly increases the gradient strength in the corner region, improving the writing efficiency and reducing unnecessary overwrite, thereby enhancing the data storage capacity in shingled recording systems.
Implementation Method 1
the write heads designed for shingled recording can have a significantly wider pole than conventional heads
Implementation Method 2
When the disk rotates, air is swirled by the rotating disk adjacent an air bearing surface (ABS) of the slider causing the slider to ride on an air bearing a slight distance from the surface of the rotating disk. When the slider rides on the air bearing the write and read heads are employed for writing magnetic impressions to and reading magnetic signal fields from the rotating disk.
Data Source
AI summary
In one embodiment, a system includes a writer for shingled recording which includes a write pole having a trailing edge and first and second side edges extending from the trailing edge. The writer further includes a shield extending along and about parallel to at least an entire length of the trailing edge, the shield also extending along at least a portion of the first side edge. Other systems are also presented which include advanced shingled writing head designs.