Biased Side Shield Lamination for Magnetic Asymmetry Reduction
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Solution Overview
Problem
Data storage devices face challenges in achieving higher data bit density and faster data transfer rates due to susceptibility to magnetic asymmetry and design variability, particularly with smaller data access elements like non-pinned trilayer magnetically responsive stacks.
Innovation Solution
A magnetic stack is separated from a side shield lamination on an air bearing surface, with a magnetically free layer having a predetermined magnetization and the side shield lamination biased to oppose it, maximizing cross-track data bit resolution and track density by minimizing magnetic width and asymmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-pinned trilayer magnetically responsive stacks are used to reduce shield-to-shield spacing, then data bit sensitivity increases, but susceptibility to magnetic asymmetry and process variability worsens
Solution Approach 1:
The patent applies asymmetry by introducing a bias magnetization in the side shield lamination that opposes the magnetization of the magnetic stack. This deliberate asymmetric magnetic configuration compensates for process variability and reduces magnetic asymmetry effects, thereby improving reliability while maintaining the reduced shield-to-shield spacing design
2Quantity of substance
If shield-to-shield spacing is reduced to increase data bit density, then track density improves, but magnetic asymmetry and design variability susceptibility worsen
Solution Approach 1:
The patent applies preliminary anti-action by pre-biasing the side shield lamination with a magnetization that opposes the magnetic stack's magnetization. This preliminary magnetic counter-action compensates for potential manufacturing variations and magnetic asymmetry before data writing occurs, enabling higher data bit density while maintaining manufacturing precision
3Measurement precision
If magnetic width is minimized to maximize cross-track data bit resolution, then data bit resolution improves, but magnetic asymmetry susceptibility increases
Solution Approach 1:
The patent applies the counterweight principle by introducing a bias magnetization in the side shield lamination that acts as a magnetic counterweight to the magnetic stack's magnetization. This opposing magnetic field compensates for magnetic asymmetry effects that would otherwise be amplified by the minimized magnetic width, thereby maintaining both high cross-track data bit resolution and reliability
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 enhances data bit resolution and track density while reducing susceptibility to process and design variability, enabling higher data access accuracy and faster data transfer in data storage devices.
Implementation Method 1
a magnetically free layer with a predetermined magnetization. A side shield lamination can be separated from the magnetic stack on an air bearing surface (ABS) and biased to a bias magnetization that opposes the predetermined magnetization
Data Source
AI summary
A magnetic element is generally provided that can be implemented as a transducing head. Various embodiments may configure a magnetic stack having a magnetically free layer with a predetermined magnetization. A side shield lamination can be separated from the magnetic stack on an air hearing surface (ABS) and biased to a bias magnetization that opposes the predetermined magnetization.