Shaped Magnetic Write Pole Extension for Shield Saturation
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Solution Overview
Problem
Magnetic recording technologies face challenges in achieving high data capacity due to limited write field and field gradient when recording small data bits, leading to reduced writeability and linear data bit densities, primarily caused by magnetic saturation of shields near the write pole.
Innovation Solution
The write pole is designed with a body portion and an extension portion that tilts at a predetermined angle towards the magnetic shield, reducing magnetic saturation and enhancing the write field gradient by optimizing the shape and configuration of the write pole and front shield to improve magnetic flux delivery and bit writeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the write pole uses a conventional design without extension portion, then the structure is simpler, but the write field gradient is insufficient and magnetic saturation occurs in the shield
Solution Approach 1:
The write pole is divided into two distinct segments: a body portion and an extension portion. The extension portion protrudes from the body portion and is positioned closer to the magnetic shield, creating a segmented structure that allows independent optimization of each segment's function to resolve the contradiction between structural simplicity and write field gradient.
Solution Approach 2:
The extension portion extends in a direction toward the magnetic shield, adding a spatial dimension to the write pole structure. This dimensional extension creates a closer proximity between the write pole and shield, enabling enhanced write field gradient without requiring complex multi-component assemblies.
2Power
If the write pole extends closer to the magnetic shield, then the write field gradient is enhanced, but the magnetic saturation of the shield increases
Solution Approach 1:
The extension portion is designed with specific local characteristics including a first width at its distal end and a second width at its proximal end, where the first width is less than the second width. This local geometric variation creates optimized magnetic flux distribution in different regions of the extension portion, enhancing write field gradient while controlling magnetic saturation in the shield.
Solution Approach 2:
The extension portion incorporates specific dimensional parameters including a first width, second width, and thickness, with the first width being less than the second width. These parameter variations are optimized to control magnetic flux density distribution, allowing the extension to enhance write field gradient while preventing excessive magnetic saturation in the adjacent shield.
3Power
If the extension portion has parallel sides tilting towards the shield, then magnetic flux distribution is optimized, but the manufacturing precision requirements increase
Solution Approach 1:
The extension portion features asymmetric geometry with parallel first and second sides that tilt at predetermined angles toward the magnetic shield. The first width at the distal end is deliberately made less than the second width at the proximal end, creating an asymmetric profile that optimizes magnetic flux delivery while providing clear manufacturing guidelines through defined geometric relationships.
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 enhances write field gradient and data bit writeability, allowing for increased data capacity and improved magnetic recording performance, especially in high linear bit density recordings by minimizing magnetic saturation and optimizing magnetic flux distribution.
Implementation Method 1
The extension portion may be capable of enhancing a write field gradient of the magnetic shield by reducing magnetic saturation
Implementation Method 2
reducing magnetic saturation
Data Source
AI summary
A magnetic shield is adjacent a write pole. The write pole has a body portion with a body thickness and an extension portion with parallel first and second sides that each tilt towards the magnetic shield at a predetermined angle proximal to an air bearing surface (ABS). The extension portion may be capable of enhancing a write field gradient of the magnetic shield by reducing magnetic saturation.