Tapered Side Shield Sidewalls for Magnetic Head ATI Mitigation
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Solution Overview
Problem
In high data bit density data storage environments, the reduction in physical size and tolerances of device components leads to manufacturing and operational performance difficulties due to adjacent track interference (ATI) and magnetic field loss, as lateral magnetic shields saturate with magnetization intended for the magnetic access feature, reducing magnetic field and gradient.
Innovation Solution
A magnetic element with a write pole having a continuous first taper angle connecting leading and trailing edges, positioned adjacent to a side shield with tapered sidewalls that are tuned to provide a predetermined magnetic extent, minimizing magnetic flux saturation and optimizing magnetic field and gradient for improved data bit access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lateral magnetic shields are added to reduce adjacent track interference, then ATI is reduced, but magnetic field and gradient are lost due to shield saturation
Solution Approach 1:
The side shield is designed with non-uniform thickness, being thicker at the leading edge and thinner at the trailing edge. This local variation in shield thickness creates different magnetic shielding characteristics at different positions, allowing the shield to block adjacent track interference effectively while maintaining sufficient magnetic field and gradient for data access by preventing complete saturation.
Solution Approach 2:
The shield thickness parameter is varied along the length of the side shield. By changing the thickness parameter from the leading edge to the trailing edge, the magnetic properties of the shield are optimized to balance interference blocking and field maintenance, preventing the shield from saturating completely and thus preserving magnetic field and gradient.
2Quantity of substance
If physical size of device components is reduced to increase data bit density, then data bit density is improved, but manufacturing and operational performance deteriorate due to ATI and magnetic field loss
Solution Approach 1:
The non-uniform shield thickness creates localized magnetic shielding zones that are optimized for both interference blocking and field maintenance. This local quality variation allows the reduced-size components to maintain sufficient magnetic field strength and gradient even at higher data bit densities where component sizes are reduced.
Solution Approach 2:
By varying the shield thickness parameter along the shield length, the magnetic characteristics are optimized to prevent saturation while maintaining field strength. This parameter optimization enables reduced form factor components to achieve high data bit density without sacrificing manufacturing and operational performance.
3Object-affected harmful factors
If shield thickness is increased to block more interference, then adjacent track interference is reduced, but magnetic flux saturation increases
Solution Approach 1:
The shield thickness is locally optimized at different positions along the side shield. The leading edge has greater thickness for interference blocking, while the trailing edge has reduced thickness to prevent magnetic flux saturation. This local quality variation resolves the contradiction by providing different shielding strengths at different locations.
Solution Approach 2:
The shield thickness parameter is changed along the length of the shield to balance interference blocking and saturation prevention. By varying the thickness parameter, the design achieves effective ATI reduction without causing complete magnetic flux saturation that would harm data access 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 effectively mitigates magnetic flux saturation and adjacent track interference, enhancing data writing performance and maintaining magnetic field and gradient in reduced form factor data storage devices, thereby improving data bit density and reducing side track erasure.
Implementation Method 1
a side shield with tapered sidewalls that are tuned to provide a predetermined magnetic extent, minimizing magnetic flux saturation and optimizing magnetic field and gradient
Data Source
AI summary
A data writer may be generally configured at least with a write pole that has a pole sidewall and a continuous first taper angle connecting leading and trailing edges. The write pole can be positioned adjacent to a side shield that is configured with first and second shield sidewalls tapered to a shield tip that is the closest point between the write pole and side shield.