Trailing Shield Gaps for Magnetic Induction and Leakage Control
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Solution Overview
Problem
Conformal wrap around shield structures in magnetic heads reduce magnetic induction rates and do not effectively increase magnetic field gradients due to their angular shape, leading to magnetic field leakage and information erasure issues in adjacent tracks.
Innovation Solution
A magnetic head design featuring a main magnetic pole with a trailing shield, a trailing gap between the trailing shield and the main pole, side shields, side gaps, and trailing shield gaps, where the trailing shield gaps extend beyond the side gaps, allowing for improved magnetic induction and reduced magnetic field leakage by modifying the shield structure to ease magnetization tilting and create closure domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conformal wrap around shield structure is used, then the shield structure is simple and compact, but the magnetic induction rate is reduced and the magnetic field gradient does not increase effectively
Solution Approach 1:
The shield structure is divided into multiple segments: a trailing shield, side shields, and gaps between them. This segmentation allows the magnetic field to be more effectively controlled and directed, increasing the magnetic induction rate while maintaining structural manageability through modular design
Solution Approach 2:
Different regions of the shield structure are given different properties: the trailing shield has a specific shape and position to optimize magnetic field gradient, while the side shields are positioned to reduce leakage to adjacent tracks. This local optimization resolves the contradiction by tailoring specific areas to their functional requirements
2Measurement precision
If a T-gap WAS structure is used, then the magnetic field gradient is increased and SNR is improved, but information erasure occurs in nearby tracks due to magnetic field leakage
Solution Approach 1:
The harmful magnetic field leakage is extracted and directed away from adjacent tracks by optimizing the gap configurations and shield positions. The trailing gap and side gaps are specifically designed to channel magnetic flux away from sensitive areas, reducing information erasure while maintaining the beneficial magnetic field gradient
Solution Approach 2:
The potential harmful magnetic field leakage is converted into a beneficial effect by strategically positioning the gaps and shields. The leakage that would normally cause information erasure is redirected to serve the magnetic field gradient enhancement, turning a harmful factor into a useful one
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 design enhances the effective magnetic induction rate and signal-to-noise ratio while reducing magnetic field leakage, enabling higher recording densities and minimizing incorrect erasures.
Implementation Method 1
a magnetic head having a shield structure around the main pole which reduces the induction rate of the trailing magnetic shield
Implementation Method 2
the magnetic field leakage of the recording magnetic field to adjacent tracks is reduced by providing side shields
Data Source
AI summary
In one embodiment, a magnetic head includes a main magnetic pole, a trailing shield positioned on a trailing side of the main magnetic pole, a trailing gap positioned between the trailing shield and the main magnetic pole, side shields positioned on either side of the main magnetic pole in a cross-track direction, side gaps positioned between the side shields and the main magnetic pole on either side of the main magnetic pole in the cross-track direction, and trailing shield gaps positioned on either side of the main magnetic pole in the cross-track direction between the trailing shield and the side shields, wherein the trailing shield gaps extend beyond the side gaps in a direction parallel to the cross-track direction. In addition, a method for producing a magnetic head as described above is also disclosed, according to one embodiment.