Biased 2D Magnetic Sensor for Multi-Track Readback
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Solution Overview
Problem
The data storage industry faces challenges in designing transducing elements that can efficiently read multiple data tracks simultaneously across various skew angles, especially in reduced track pitch environments, leading to misalignment and reduced readback data rate due to the limited skew angle coverage and increased complexity in compact form factors.
Innovation Solution
A magnetic sensor configuration with a bias magnet disposed between multiple read sensors, allowing them to be concurrently biased to a predetermined magnetization, enabling simultaneous access to multiple data tracks regardless of skew angle and reducing adjacent track interference, while maintaining a compact design and high readback data rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple read sensors are used to read multiple data tracks simultaneously, then readback data rate is improved, but device complexity increases
Solution Approach 1:
Multiple read sensors are integrated into a single transducer assembly with a shared bias magnet structure. The bias magnet is positioned to simultaneously bias multiple read sensors, combining what would otherwise be separate biasing systems into one unified component, thereby reducing overall device complexity while maintaining multi-track reading capability
Solution Approach 2:
The bias magnet structure is designed to serve multiple functions: it provides biasing fields for multiple read sensors simultaneously and is positioned to enable the transducer to access multiple data tracks. This multi-functional design allows a single component to support the complex operation of simultaneous multi-track reading without proportionally increasing device complexity
2Quantity of substance
If track pitch is reduced to increase data density, then storage capacity is improved, but skew angle coverage is reduced
Solution Approach 1:
The patent transitions from single-track reading to two-dimensional magnetic recording by positioning multiple read sensors to access multiple data tracks simultaneously. This dimensional change from one-track to multi-track access allows the system to maintain adequate skew angle coverage even when individual track pitch is reduced, as the combined sensor array covers a broader angular range
3Productivity
If read sensors are positioned to access multiple data tracks, then readback data rate is improved, but misalignment occurs due to limited skew angle coverage
Solution Approach 1:
Each read sensor within the array is positioned with specific local optimization for its assigned data track, while the overall array geometry is designed to provide global coverage across multiple skew angles. This local quality approach allows precise alignment for each sensor-track pair while maintaining overall system adaptability to varying skew conditions
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 allows for efficient two-dimensional data sensing across various skew angles, increasing readback data rate and reducing misalignment issues, while simplifying the fabrication process and maintaining a compact form factor, thus addressing the limitations of existing transducing elements in high data bit density environments.
Implementation Method 1
a bias magnet configured to concurrently bias each read sensor to a default predetermined magnetization
Data Source
AI summary
Apparatus for two dimensional reading. In accordance with some embodiments, a magnetic read element has a bias magnet disposed between a plurality of read sensors. The bias magnet may be configured to concurrently bias each read sensor to a predetermined magnetization.