Notched Pole Tip Shield for Magnetic Write Element
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Solution Overview
Problem
In magnetic storage devices, increased areal density leads to reduced track width and spacing, causing adjacent track erasure or interference, and magnetic shields can interfere with write performance due to flux leakage.
Innovation Solution
A pole tip shield with side shields extending along the pole tip, featuring a notched or truncated portion to create an expanded non-magnetic gap region, which enhances the write field and field gradient while limiting adjacent track interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic shields are used to reduce adjacent track interference, then adjacent track erasure is reduced, but flux leakage to the shields interferes with write performance
Solution Approach 1:
The side shields are segmented with notched or truncated portions removed from their structure. This segmentation creates gaps in the shield continuity, allowing the magnetic flux to pass through rather than leak along the shield surface, thereby reducing flux leakage while maintaining adjacent track interference protection.
Solution Approach 2:
Specific portions of the side shields are extracted or removed to create notches or truncations. By taking out these specific segments of the shield material, the design eliminates the flux leakage paths that would otherwise interfere with write performance, while the remaining shield structure continues to protect against adjacent track interference.
2Quantity of substance
If track spacing is reduced to increase areal density, then storage capacity increases, but adjacent track erasure or interference increases
Solution Approach 1:
The side shields are designed with non-uniform geometry featuring notched or truncated portions at specific locations. This local variation in shield structure creates regions of different magnetic field characteristics, providing enhanced protection against adjacent track interference precisely where needed while maintaining overall system performance at reduced track spacing.
Solution Approach 2:
The side shields exhibit asymmetric geometry with notches or truncations positioned at specific locations rather than uniform symmetry. This asymmetric design allows tailored control of magnetic flux distribution to combat adjacent track interference effects that become pronounced at reduced areal densities.
3Object-affected harmful factors
If side shields are extended along the pole tip, then adjacent track interference is limited, but flux leakage increases
Solution Approach 1:
The extended side shields are segmented with notched or truncated portions removed along their length. This segmentation maintains the extended geometry needed for adjacent track protection while creating discontinuities that prevent continuous flux leakage paths along the shield surface.
Solution Approach 2:
Specific portions of the side shield material are discarded through notching or truncation to eliminate flux leakage paths. By strategically removing these portions, the design recovers write performance by reducing flux leakage while the remaining shield structure continues to provide adjacent track interference protection.
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
The solution effectively reduces flux leakage and enhances write performance by maintaining manageable adjacent track interference while improving the write field and field gradient.
Implementation Method 1
The side shields include a notched or truncated portion downtrack from the midpoint of the pole tip to form an expanded non-magnetic gap region larger than a non-magnetic gap region along a forward portion of the pole tip to enhance write field and field gradient
Implementation Method 2
Magnetic shields are used to reduce adjacent track erasure and interference, however, flux leakage to the shields can interfere with write performance
Data Source
AI summary
The application discloses pole tip shield assemblies for a magnetic write element. The shield assemblies disclosed include side shields to limit adjacent track interference. The side shields are truncated or notched at a midpoint to form an expanded non-magnetic gap along a trailing portion of the pole tip to enhance write field and/or field gradient. The expanded non-magnetic gap region is larger than the non-magnetic gap region along a leading portion of the pole tip.