Write Pole Side Shield Gap for Magnetic Head
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Solution Overview
Problem
Current data storage devices face challenges in balancing reduced magnetic footprint with increased data bit density, leading to diminished magnetic output and compromised bit error rates due to magnetic shunting and loss of magnetic flux.
Innovation Solution
A magnetic element with a write pole continuously extending from the air bearing surface, featuring a magnetic shield separated by optimized gap distances, which are greater distal to the air bearing surface, to maintain effective magnetic field output and enhance data bit resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic shield is placed closer to the write pole to reduce magnetic footprint, then data bit resolution improves, but magnetic flux shunting increases and magnetic output diminishes
Solution Approach 1:
The patent applies local quality by implementing different gap distances at different locations: a first gap distance at the air bearing surface (ABS) and a second, larger gap distance distal to the ABS. This localized variation optimizes shielding effectiveness at the ABS while reducing magnetic flux shunting in the body portion, thereby resolving the contradiction between improving data bit resolution and minimizing magnetic flux loss.
Solution Approach 2:
The magnetic shield gap is segmented into two distinct regions: a first gap distance region at the ABS and a second gap distance region distal to the ABS. This segmentation allows independent optimization of each region's gap distance, enabling the shield to provide effective magnetic field gradient at the ABS while minimizing flux shunting in the extended body portion.
2Quantity of substance
If the magnetic footprint is reduced to increase data bit density, then areal density capacity increases, but magnetic field output diminishes
Solution Approach 1:
The varying gap configuration provides strong magnetic field gradient locally at the ABS where high data bit density is required, while the increased gap distance distal to the ABS prevents excessive flux shunting that would diminish overall magnetic field output. This local optimization resolves the contradiction between increasing areal density capacity and maintaining magnetic field power.
3Ease of manufacture
If uniform gap distance is used between write pole and magnetic shield, then manufacturing simplicity is maintained, but magnetic noise increases and shielding effectiveness is compromised
Solution Approach 1:
The patent implements local quality by specifying different gap distances for different regions: a first gap distance at the ABS and a second, larger gap distance distal to the ABS. This non-uniform configuration reduces magnetic noise and improves shielding effectiveness by preventing flux shunting in the body portion, while maintaining manufacturability through defined geometric parameters.
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 optimizes data bit resolution and magnetic field gradient, reducing magnetic noise and increasing areal density capacity while minimizing the risk of magnetic shunting, thereby improving data writing performance in high-density environments.
Implementation Method 1
loss of magnetic flux
Implementation Method 2
magnetic shunting
Data Source
AI summary
A magnetic element can be configured with a write pole that continuously extends from an air bearing surface along a plane orthogonal to the air bearing surface. A magnetic shield can be separated from the write pole by a first gap distance on the air bearing surface throughout a tip portion of the write pole and by a second gap distance distal the air bearing surface along the plane orthogonal to the air bearing surface along a body portion of the write pole with the first and second gap distances measured parallel to the air bearing surface and the second gap distance being greater than the first gap distance.