Single Coil Turn Data Writer for High Density Recording
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Solution Overview
Problem
Magnetic recording devices face challenges in achieving high data density while minimizing magnetic flux leakage and erasure fields, especially in high track density environments like shingled magnetic recording, due to strong write fields required for data writing.
Innovation Solution
A data writer configuration with a narrow side shield gap and a single write coil turn is used to optimize write field strength and efficiency, featuring a short core length and tuned magnetic pole shapes to reduce erasure fields and magnetic flux leakage, while maintaining strong write field performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong write fields are utilized to saturate data storage medium and generate transitions between data bits, then data writing performance is improved, but erasure and magnetic flux leakage increase which can be harmful in high track density recording environments
Solution Approach 1:
The write coil is segmented into a single turn configuration rather than multiple turns, which concentrates the magnetic flux more effectively and reduces leakage. The write pole is segmented with a specific geometry that confines the magnetic field to the intended track area, reducing erasure effects on adjacent tracks.
Solution Approach 2:
The write pole has a tailored geometric profile with specific dimensions and shapes optimized for local field concentration. The single coil turn is positioned and dimensioned to create a highly localized strong write field exactly where needed, while the field strength drops off rapidly away from the target area, minimizing erasure and flux leakage to surrounding regions.
2Quantity of substance
If data density is increased to achieve higher storage capacity, then storage capacity is improved, but magnetic flux leakage and erasure fields become more problematic in high track density environments
Solution Approach 1:
The write coil is configured as a single turn rather than multiple turns, which segments the current path to create a more concentrated and controlled magnetic flux distribution. This segmentation allows the magnetic field to be more precisely confined to the intended track, reducing leakage problems that become critical at high data densities.
Solution Approach 2:
The write pole geometry is optimized with specific dimensional parameters including pole width, length, and profile shape that are tuned for high-density recording. The single coil turn parameters such as turn diameter, wire thickness, and position are adjusted to generate the required field strength while minimizing leakage, enabling reliable operation at increased track densities.
3Force
If multiple coil turns are used to generate sufficient write field strength, then write field strength is improved, but device complexity and magnetomotive force requirements increase
Solution Approach 1:
Instead of using multiple coil turns which would increase complexity, the design segments the magnetic circuit through optimized pole geometry and uses a single coil turn with carefully controlled dimensions. This segmentation approach achieves the required field strength through geometric optimization rather than increased coil complexity.
Solution Approach 2:
The write pole dimensional parameters including width, length, and geometric profile are optimized to maximize field generation efficiency. The single coil turn parameters such as diameter, wire cross-section, and positioning are adjusted to achieve sufficient write field strength without requiring multiple turns, thereby reducing device complexity while maintaining or improving write performance.
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 achieves increased data bit writability and reduced side track erasure, enabling higher linear and track densities with lower magnetomotive force and faster field switching, improving writing efficiency and precision.
Implementation Method 1
a write coil that has a single turn and continuously extends to opposite sides of the write pole
Data Source
AI summary
A data writer may be configured with at least a write pole continuously extending from an air bearing surface to a via. The write pole can contact at least one yoke that contacts the write pole. The write pole and yoke may each be disposed between and separated from a write coil that has a single turn and continuously extends to opposite sides of the write pole.