Notched Write Pole for Hypertrack Phase Alignment
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Solution Overview
Problem
Existing magnetic data recording systems face challenges in maintaining proper phase alignment between sub-tracks of a patterned media hypertrack, especially at extreme locations on the disk, which complicates the combination of hypertrack and shingled recording due to slider skew.
Innovation Solution
A magnetic write head with a notched write pole forming a write bubble with convex lobes and a centrally disposed concave region, allowing for proper phase relationship maintenance between hypertracks and enabling shingled recording by adjusting the radial location of the write head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional write head is used for patterned media hypertrack recording, then the basic writing function is achieved, but proper phase alignment between sub-tracks cannot be maintained at extreme disk locations
Solution Approach 1:
The write pole is designed with an asymmetric structure featuring a notched trailing edge, creating an asymmetric magnetic write bubble with convex lobes positioned to align with sub-track centers. This asymmetric geometry compensates for slider skew at extreme disk locations, maintaining proper phase alignment between hypertrack sub-tracks that conventional symmetric write heads cannot achieve.
Solution Approach 2:
The write bubble is engineered with non-uniform magnetic field distribution, creating convex lobes with concentrated flux at specific locations. The notched trailing edge produces localized high-field regions that precisely target sub-track centers, providing locally optimized writing capability for hypertrack phase alignment while the rest of the write bubble maintains overall recording function.
2Quantity of substance
If hypertrack recording is implemented, then data density is increased, but combining with shingled recording becomes complex due to phase alignment issues
Solution Approach 1:
The asymmetric notched write pole design inherently provides the phase alignment capability needed for both hypertrack and shingled recording modes. By positioning convex lobes to align with sub-track centers, the same write head structure enables complex combined recording modes without requiring additional alignment mechanisms, reducing overall system complexity.
3Manufacturing precision
If the write head is positioned to write to one track, then that track is properly written, but adjacent tracks may be affected by stray magnetic flux
Solution Approach 1:
The notched trailing edge creates a localized concentration of magnetic flux in the form of convex lobes that are precisely positioned over the target track. This local flux concentration achieves high writing accuracy to the intended track while the overall write bubble geometry and flux distribution minimize stray field effects on adjacent tracks, improving track isolation.
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 ensures accurate phase alignment and data recording across multiple tracks, even at extreme disk locations, enhancing data recording efficiency and stability in hypertrack and shingled recording systems.
Implementation Method 1
An electrically conductive write coil induces a magnetic flux through the write coil. This results in a magnetic write field being emitted toward the adjacent magnetic medium
Implementation Method 2
A magnetoresistive sensor such as a GMR or TMR sensor can be employed for sensing magnetic fields from the rotating magnetic disk
Data Source
AI summary
A magnetic recording system configured for recording to a bit patterned media using both hypertrack recording and shingled recording. The magnetic recording system includes a write pole with a notched trailing edge that results in a write bubble with a trailing edge that has two outer convex lobes separated by a centrally disposed concave region. By locating one of the lobes over first and second data tracks of a hypertrack, a proper alignment of the relative phase of the two tracks can be maintained. Further adjustment to the alignment can be achieved by adjusting the radial location of the write head.