Write Head Asymmetric Shield Gap Design
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Solution Overview
Problem
Magnetic recording heads face challenges in maintaining data-recording reliability and reducing erasure at high recording densities due to side track erasure and adjacent track interference, primarily caused by the trailing shield-side shield gap in write heads.
Innovation Solution
The write head design incorporates a reduced side to trailing shield spacing compared to the write pole-trailing shield gap, with the trailing shield-side shield gap being substantially less than the trailing shield-write pole gap, to minimize erasure by reducing the amplitude and angle of the erasure field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the trailing shield-side shield gap is reduced, then side track erasure and adjacent track interference are reduced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating an asymmetric gap structure where the trailing shield-side shield gap is deliberately made smaller than the write pole-trailing shield gap. This localized geometric modification targets specifically the side track erasure problem without requiring complete redesign of the entire write head structure, thus improving reliability while limiting complexity increase to a specific region.
Solution Approach 2:
The patent changes the geometric parameters of the shield gaps, specifically setting the trailing shield-side shield gap to be substantially less than the trailing shield-write pole gap. This parameter modification directly addresses the erasure field amplitude and angle, reducing side track erasure and adjacent track interference while maintaining functional performance.
2Object-affected harmful factors
If the trailing shield-side shield gap is reduced, then the erasure field amplitude and angle are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent modifies the gap spacing parameters to create an asymmetric structure where the trailing shield-side shield gap is substantially less than the write pole-trailing shield gap. This parameter change reduces the erasure field amplitude and angle, confining erasure impact to a smaller area while improving data recording 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 design effectively reduces the probability of magnetization reversal and erasure, enhancing the reliability and efficiency of data recording by confining the erasure impact to a smaller area, thereby improving the overall performance of the write head.
Implementation Method 1
Current is supplied to write coils to induce a flux path in the main pole to record data on one or more magnetic storage layers of the media
Implementation Method 2
A trailing shield-write pole gap is present between the trailing edge of the write pole and the trailing shield, and a trailing shield-side shield gap is present between the trailing shield and the side shields
Data Source
AI summary
A write head including a bearing surface and a write pole having a front surface that forms a portion of the bearing surface. The front surface has a leading edge, a trailing edge and side edges connecting the leading and trailing edges. The write head also includes side shields proximate to the side edges of the write pole, and a trailing shield over the write pole and the side shields. A trailing shield-write pole gap is present between the trailing edge and the trailing shield, and a trailing shield-side shield gap is present between the trailing shield and the side shields. The trailing shield-shield shield gap is substantially less than the trailing shield-write pole gap.